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jquery check if element exists in array

One file might result in an array of animals[dog, cat, fish], whilst the next might be animals[horse, bird, dog, cat, snake]. LAST QUESTIONS. How to check if array element exists or not in javascript? September 16, 2017, at 05:37 AM. For example - you are dynamically listing records from the MySQL database table here, you have a requirement to add a search filter based on keypress. For instance, we write. The time complexity of this method is O(n). Its solution as bellow. How To Check If Value Exists In Javascript Object - Fai una domanda. so we can easily check if array is empty null undefined in javascript. To check whether the value exist in array, first method comes in our mind is to use loop and check each value. If you need to check if value exists in jquery array then you can do it using jquery inarray function. Otherwise you should check the length of the resulting . we can check if value exist in json array using inArray () of javascript. $.inArray will help you to find and check if value is exists or not. If it is a non-zero positive number, it means an element exists in the List. We can use indexof () method of javascript to check whether a particular value or item exists in the array. jquery selector id that starts with too many requests jquery laravel input type=file events jquery append scripts using jquery footer credits with jquery . If you know that the object is always there and that it only occurs once, you can just use result[0].foo to get the value. In algorithm terms it's a Linear Search. Check Value exists in array using Indexof () method -. In this blog, I will show how to check if value exists in a javascript array.we will explain check if value exists in an array javascript. The some () method returns true if the user is present in the array else it returns false. Casa. Check if the elements from the first array exist in the object or not. In case you can use jQuery AJAX which requests and load data from the server every time when the user press key in . Copy the first two array elements to the last two array elements array of objects create common key as a property and create array of objects If there are an odd number of elements in the array, return the element in the middle of the array. 1. 12:50 . so you can see here: var last_element = languages [languages.length - 1]; As i give you above piece of code you can see . for . The $.inArray () method is similar to JavaScript's native .indexOf () method in that it returns -1 when it doesn't find a match. predicate is the Predicate that is used to check in the array elements. Syntax: jQuery.inArray ( search-value, value-from-which-search); If you need to check the value in the jQuery array you can do it using the jQuery inarray function function. The indexOf() method is case sensitive. Note: Also check 2 Ways to Remove Value from Array in jQuery Usage of jQuery.inArray () method Here we have an array variable that contains values as fruit names. Make Sure Your Firm Is Part Of Our Growing List! HTML. In the article, Chris talks about a :placeholder-shown pseudo-class. For instance, we write. How to check if event exists on element in jQuery? The indexOf () method returns the index of the element contained in the array if it is found, otherwise, it returns -1 if it is not found. Click Here LINKS & REFERENCES. I have a DTO that contains a list where I add or I remove some items, in my DAO when I get this list, I want to compare it with the existing one, so all new items that doesn't exist in the old list will be added, and the items in the old list that doesn't exist in the list in the dto will be deleted. Or else, returns They return one or more matching elements within a document. If the element does not exist in the array it returns -1. Using JavaScript's inbuilt method. In this example, I explain how to check if key exists in an array using laravel.We will show example of laravel check if key exists in an array using laravel Arr::has() method. Use the .length property of the jQuery collection returned by your selector: 1 2 3 4 5 if ( $ ( "#myDiv" ).length ) { $ ( "#myDiv" ).show (); } Note that it isn't always necessary to test whether an element exists. You can use the indexOf () method to check whether a given value or element exists in an array or not. we will use simple if condition and length of array with checking. I have the following function which supposed to add a value to an array if does not exist. If, say, the fifth element of animals is snake, then I will have the program do something. 2. However, this only works if the array is at least 5 elements long. The in_array () function is used to check whether a given value exists in an array or not. If the first element within the array matches value, $.inArray () returns 0 Example Code : We can add or delete elements from an ArrayList whenever we want, unlike a built-in array. Use typeof arrayName[index] . tag. If we find the match then value exist in array otherwise value does not exist in an array. Click Here: OBJECT[KEY] !== undefined: Checks if the given key is defined in the object. If the function finds the value, it returns the index position of the value and -1 if it doesn't. Syntax Syntax jQuery.inArray( value, array [, fromIndex ] ) How to check if onClick exists on element in jQuery? In this article, we will implement a check if last element in array javascript. To push an element in an array if it doesn't exist, use the indexOf() method to check if the value is present in the array. In our if statement, we check if the method returned -1.If it did, we know that the value is not present in the array and we should add it. Check whether field exist in MongoDB or not? c# x 265843. java x 207528. php x 193419. javascript x 179138. jquery x 155214. android x 139508. iphone x 112897. c++ x 109975.net x 105119. asp.net x 104219. controlla se l'array esiste in php mongodb? PUBBLICO. Question about: php,mongodb. Make Sure Your Firm Is Part Of Our Growing List! 0. If element exists in the jQuery array it returns the index position of the value and if the value doesn't exist then it will return -1. jQuery.inArray () method works with the both string and an array. bash check if symlink exists. Domande. Let's take our example above an modify it to use the jQuery library instead: . If it doesn't exist then assign properties === elements in the array. We can check whether an element exists in ArrayList in java in two ways: Using contains() method; Using indexOf() method. Checking if element exists with . For making your searching process simpler you can use jQuery and JavaScript inbuilt function. Jquery add value to an array if does not exist . 10:50. Using $ (selector).length To check if an element is present in DOM with jQuery, you can use the selectors. Start Transacting Today. Using $ (selector).length. Check if element exists in array using Java 8. How to change start point of animation in CSS? in my testing, hasOwnProperty can check if anything exists at an array index. And getData is a pretty heavy operation, comparing it to checking if the content is empty. If the value is available it returns its index, and if value not exists then it returns -1. This post will discuss how to check whether an element exists with a given class in JavaScript and jQuery. Second solution in includes () method used check given array value or element exists or not But this method returns only true or false instead of index nmber, as you can see here: I give you two solution for JQuery Remove Element From Array If Exists. All jQuery queries include a number of functions and properties. In this post, we will look at different ways to check if every element of the first array exists in the second array. If element not exist in given array it will return -1. If it does not exist, then we loop through the array manually and check if the element exists. Both querySelector() and getElementById() returns null when the element doesn't exist, so you can check the result as follows: But includes() method treats it (NaN) as a different way and returns true. This method is return the index of the element inside the array. array is the given one-dimensional array, where we are checking. The semantics of 'contains' is not straightforward at all. You can use the some () method to check if an object is in the array. The jQuery's .hasClass () method returns true if the specified class is assigned to an element. As you can see, with jQuery, it is even simpler to check if an element exists or not. In algorithm terms it's a Linear Search. June 12, 2021 October 12, 2021 admin 0 Comments check if a string is in an array of strings java, check if an element exists in an array in java, check if array contains value java, check if value exists in array, how to search an element in an array in java, java array contains int, write a java program to test if an array contains a specific . we will use jquery array filter function for remove empty or null value. The comparison between values is strict. Unable to get sass file to override existing stylesheet. How to check if multiple elements with same class exist using jQuery? For example, the following will return true if the div contains container as a class. To check if a value exists in an object using JavaScript, we use the Object.values and the array includes method. If no item is found, it returns -1.,In this article, we looked at 5 different JavaScript Array's methods to check if an item exists in an array.,Want to check if all elements in an array satisfy a certain condition? How to check if array element exists or not in javascript? As you are already using jQuery, you can use the grep function which is intended for searching an array: var result = $.grep(myArray, function(e){ return e.id == id; }); The result is an array with the items found. Copy the first two array elements to the last two array elements array of objects create common key as a property and create array of objects If there are an odd number of elements in the array, return the element in the middle of the array. Method 5 : Using count () We can use the in-built python List method, count (), to check if the passed element exists in List. Truth be told, this code block will rarely execute, as JavaScript's includes() method is supported by almost all modern web browsers. Then we call includes with the value we're looking for in obj. $.inArray function will return the index of element. jQuery inArray () Method is used to check if value exists in Array and return its index. Visto volte 3,389. I n this tutorial, we are going to see how to check if a value exists in an array in PHP. JavaScript contains a few built-in methods to check whether an array has a specific value, or object. This jQuery array method search the the item within the array. we will show you how to check if the value exists in a javascript array there are three types of checks if a value exists in a javascript array. This method searches the array for the given item and returns its index. The in_array () function is used to check whether a given value exists in an array or not. Here you can see full example of delete empty or null values from array in jquery. Using my first example would result in an Error, as it only has three elements. Method 1: Using contains() method To check if a value exists in an object using JavaScript, we use the Object.values and the array includes method. springboard diving camps 2021 near me. The time complexity of this method is O(n). However, this only works if the array is at least 5 elements long. In the latest JavaScript standard 2015 (ES6), JavaScript has added an inbuilt method on arrays to check if they contain the element. 1. How to check if a key exists in an array in PHP. Here you can see piece of code to getting last element of array in jquery. To check whether the value exist in array, first method comes in our mind is to use loop and check each value. Here you can see full example of delete empty or null values from array in jquery. So, we can check it very simply weather a value exist in array or not. Because JavaScript treats 0 as loosely equal to false (i.e. How do I test whether an element exists? And that is how you get your element. TypeScript 2022-03-27 19:05:06 use of slice and splice add elements array TypeScript 2022-03-27 18:50:23 android studio loop through all objects in layout TypeScript 2022-03-27 17:55:26 Given an array, A, of integers, print N's elements in reverse order as a single line of space-separated numbers. Definition of Array.Exists: This method is defined as below: public static bool Exists<T> (T[] array, Predicate<T> predicate); This is a static method. const exists = Object.values (obj).includes ("test1"); to get an array of property values in object obj with Object.values. How to check if Element exists in c# Selenium drivers? Watch the jQuery element exists screencast (Alternative flash version) QuickTime version is approximately 10Mb, flash version is streaming. Let's take a look at the following example: Example Try this code » If element exist then return true else return false . If need for jquery check if array is empty or undefined then i will help you. In the article, Chris talks about a :placeholder-shown pseudo-class. So, as long as the above is true, you can simply: const arrayHasIndex = (array, index) => Array.isArray(array) && array.hasOwnProperty(index); usage: arrayHasIndex([1,2,3,4],4); outputs: false. To check if an object is empty or not. In this tutorial, I'll show you the way I do it. It works both with string and an Array. We are going to check for a value's existence in an array in 2 different ways using jQuery and Javascript 1) Using jQuery If you are someone strongly committed to using the jQuery library, you can use the .inArray ( ) method. 6:40. Check if the given value exists in the array. jQuery inarray function will help you find and check whether a value exists or not. It returns TRUE if the given value is found in the given array, and FALSE otherwise.,How to check whether an array is empty using PHP?,Program 2: The below program performs the search using in_array . Using jQuery. 1:20. Therefore, to get the reference to the original HTML element we either use the get() method or the array notation [] when using hasAttribute with jQuery (where 0 is the index which points to the first element in the collection of elements found by jQuery selector . I'm having issues with my style in laravel. We can use the Array.prototype.every() method (which was introduced in ES5) to check whether all elements in the array pass the test implemented by the provided function. If you run the snippet above, you should see an alert dialog saying "Element exists . In general, it would be better to use 'index' to test if an array has a specific value, e.g. Y ou can use the indexOf () method to check whether or not a given value or element exists in an array. var category_json = new Array(); $.ajax({ type: 'POST', url: "<?php echo base_url(); ?>Reports/appointment_distribution_by_group/", dataType: 'JSON', data: {county: county, sub_county: sub_county, facility: facility, date_from: date_from, date_to: date_to . 01:50. you can see bellow example to checking javascript json array value exist or not. Create an empty object and loop through first array. If it doesn't find the value then it returns -1. There can be many ways to check if an element already exists in an array. Check if an item already exists in an array in Vue.js/Vuex/ES6 . Here's an example that displays an alert on button click if the specified element exists. We can use that with Array.prototype.includes() (which was introduced in ES7) like so: Then check the .length property or call the .size () method to get the size of the jQuery object array returned. The Array.includes() method check if element is included in . $.isArray() returns a Boolean indicating whether the object is a JavaScript array (not an array-like object, such as a jQuery object). This function returns TRUE on success or FALSE on failure. Chiesto 9 anni, 8 mesi. Loop through second array and check if elements in the second array exists on created object. View the demo used in the screencast. To check if an element is present in DOM with jQuery, you can use the selectors. This function returns a true value if the key exists and returns false if the key does not exist. I prefere this to all variable.get ('key', {}) methods I found because . In this example, i will show you how to check if value exists in array or not in javascript. It returns TRUE if the given value is found in the given array, and FALSE otherwise.,How to check whether an array is empty using PHP?,Program 2: The below program performs the search using in_array . Is there a way to check if the . The IndexOf() method returns -1 on NaN, even (NaN) value exists in the array. They return one or more matching elements within a document. When working with primitives you can use the Array.indexOf method if you prefer it over includes(). After you tried to retrieve the element using the selectors above, you can check if the specified element exists or not by checking the value returned by the methods. Syntax - value-from-which-search.indexOf ( search-value ); Completed Code Casa. Finding an Element. Here, Creating a basic example of get last element of array javascript. PHP array_key_exists() is an inbuilt function that check If an element exists in an array in php. $.inArray function will return the index of element. 1. in my testing, hasOwnProperty can check if anything exists at an array index. Click Here: ARRAY.indexOf(VALUE) Returns the index of the given value, -1 if not found: Click Here: KEY in OBJECT: Checks if the given key is in the object. To check if an object is empty or not. How to apply a condition only if field exists in MongoDB? Laravel Arr::has() function to you can check specific key or element exists in an array using dot notation.. Also, Laravel Arr::has() method to you can check item or key exists in multi dimensional array. NO JUNK, Please try to keep this clean and related to the topic at hand. If you are using jQuery, then you can use the length attribute. The best thing about the indexof () method is it works on . The in_array () function is an inbuilt function in PHP. The indexof () method returns the index of element if it is found in array otherwise it returns -1 if it's is not found. 2. Get Object array from jquery using symfony. The flag's value will only change if element is found, inside the if condition. Example Try this code » 487. This is a common task for front-end developers. This method is return the index of the element inside the array. Javascript Custom Method to check Value Exist in Array. JS. Comments are for users to ask questions, collaborate or improve on existing. We have attached the click event listener to the button element. The indexOf () method returns the index of the element inside the array if it is found, and returns -1 if it not found. And getData is a pretty heavy operation, comparing it to checking if the content is empty. This code snippet has an associative array with key and value pairs with array_key_exists() function which checks if a given key exists in it or not. How to find if a directory exists in Python? The in_array () function is an inbuilt function in PHP. This method will check if the string already exists in the array. you can easily check if array is empty or not in javascript. Here, T is the type of element of the array. The length property is the one we're interested in. How to check whether an array is a true array in JavaScript? jQuery HTML 1 2 3 4 5 6 7 8 $(document).ready(function() { So, as long as the above is true, you can simply: const arrayHasIndex = (array, index) => Array.isArray(array) && array.hasOwnProperty(index); usage: arrayHasIndex([1,2,3,4],4); outputs: false. How to check if a value exists in an array in JavaScript. I n this tutorial, we are going to see how to check if a key exists in an array in PHP. Array. arrayHasIndex([1,2,3,4],2 . Answer: Use the jQuery .length Property You can use the jQuery .length property to determine whether an element exists or not in case if you want to fire some event only if a particular element exists in DOM. If, say, the fifth element of animals is snake, then I will have the program do something. Consider the following example: how to check if the array exists in php.. Issue with Javascript performance (Odin Project, Etch-a-Sketch) 9:30. Use the every() method.,To perform a case-insensitive . TAGS. 1. Start Transacting Today. . Then we call includes with the value we're looking for in obj. The jQuery.InArray () is a built-in jquery method, used to find a given value within an array. 0 == false, but 0 !== false), to check for the presence of value within array, you need to check if it's not equal to (or greater than) -1. About Us; Services; Team; Clients; Contact Us 1 Array.includes() 2 Vuex. The :contains() is a jQuery selector that allows us to search text within the element and select it and perform an action on it. If the first element within the array matches value, $.inArray () returns 0. How to find elements of JavaScript array by multiple . Check Array of Primitive Values Includes a Value Array.includes() Function jquery selector id that starts with too many requests jquery laravel input type=file events jquery append scripts using jquery footer credits with jquery . If the passed element exists in the List, count () method will show the number of times it occurs in the entire list. In the event handler function, we are taking the value of the input element and passing it to the includes() method. Use typeof arrayName[index] . Then check the .length property or call the .size () method to get the size of the jQuery object array returned. As a result, we will get a Boolean value in return. I added this typeof check in order to provide some sort of backwards compatibility for older browsers. Array.some () The some () method takes a callback function, which gets executed once for every element in the array until it does not return a true value. If the length attribute of an element object is 0, then it does not exist. The simple test is: How to Make a dropdown readonly using Jquery 09 Oct 2016 How to count number of key/value pairs in JSON Object 08 Oct 2016 Toggle Checkboxes using JQuery (Select All/Select None) 07 Oct 2016 JavaScript Array: Checking for multiple values; How to check if multiple strings exist in another string in Python? Array.includes() Suppose you have a list AR/VR headsets and you want to check if 'Hololens' already . Note, 1 level only. const exists = Object.values (obj).includes ("test1"); to get an array of property values in object obj with Object.values. It treats "Lemon" and "lemon" as different values. Second solution in includes () method used check given array value or element exists or not But this method returns only true or false instead of index nmber, as you can see here: I give you two solution for JQuery Remove Element From Array If Exists. Note that both includes() method and the manual search in this . Home jQuery Check multiple words if exist in array jquery. Making an image stay at the bottom of the page but not go over content. How to check if element exists in the visible DOM? Javascript Custom Method to check Value Exist in Array. arrayHasIndex([1,2,3,4],2 . Using every(). Table of contents hide. You can use PHP's array_key_exists () function to check whether or not a given key or index exists in an array. 3389. how to . Post a Comment. When we select an element with jQuery, a jQuery object is returned with a collection of elements that match the specified selector. i'm trying to get object array from jqueryI have my function in deafault controller that return the query result using JsonResponse Example: Finds out if the parameter is an array. indexOf () It is a JavaScript method that returns the index position of the value. Java ArrayList is a resizable array, which can be found in java.util package. One file might result in an array of animals [dog, cat, fish], whilst the next might be animals [horse, bird, dog, cat, snake]. we will use jquery array filter function for remove empty or null value. If we find the match then value exist in array otherwise value does not exist in an array. Its solution as bellow. In this article, we'll take a look at how to check if an array includes/contains a value or element in JavaScript. Property is the predicate that is used to check if value exist array... In our mind is to use the every ( ) method at an array or not created object s (... Basic example of delete empty or null value jquery check if element exists in array we can check if element exists an image stay the. Array value exist in array, first method comes in our mind is to use and! Supposed to add a value exist in another string in Python.length property or call the jquery check if element exists in array )! Within the array is at least 5 elements long ( i.e ]! == undefined: if... As different values present in DOM with jquery, it means an element exists in the array in json value! From an ArrayList whenever we want, unlike a built-in array to the includes ( ),! True if the string already exists in an array example < /a > a... And properties more matching elements within a document footer credits with jquery you... A condition only if field exists in an array or not array exists on created object a href= https... Of this method is it works on my first example would result in an array: //jiaoqi.me/lzwzjs/uqq03q/archive.php? id=python-json-check-if-key-value-exists >! The visible DOM, comparing it to use loop and check if element not exist in array otherwise does... Array and check if array is at least 5 elements long the the within... Taking the value includes with the value is exists or not from an ArrayList whenever we want unlike! If onClick exists on element in jquery Python json check if elements in the array at! It doesn & # x27 ; m having issues with my style in.! S.hasClass ( ) result in an array to apply a condition if. All variable.get ( & # x27 ; s a Linear search Your is... Y ou can use the selectors JUNK, Please try to keep this clean and related to topic. Works if the elements from an ArrayList whenever we want, unlike a built-in array some ( ) function used! With jquery, you can use the selectors jquery queries include a number of functions and properties and false... Method., to perform a case-insensitive method treats it ( NaN ) as a class it the... ; element exists in the array is a javascript method that returns index! Example above an modify it to checking if the specified class is assigned to an element exists in array. And passing it to checking if the content is empty or null value using footer. 5 elements long and length of array with checking above an modify it to jquery check if element exists in array javascript json array inarray. Element exist then return true else jquery check if element exists in array false do I test whether an.! Can check if an object is 0, then I will have following!, Please try to keep this clean and related to the includes ( ) to... Its index, and if value exist or not given array it return... Second array exists on element in jquery exists or not clean and related to the topic hand., t is the one we & # x27 ;, { } ) methods found... Jquery queries include a number of functions and properties loosely equal to false ( i.e used. My first example would result in an array or not ; and & ;... Javascript array: checking for multiple values ; how to check if an element is in... Because javascript treats 0 as loosely jquery check if element exists in array to false ( i.e, and if value not exists then returns! You run the snippet above, you can use the indexof ( ) it is a pretty operation! One we & # x27 ; t exist then assign properties === elements in the array or not: ''... Is a pretty heavy operation, comparing it to use loop and check elements. The elements from an ArrayList whenever we want, unlike a built-in array property the! Returns false object array returned dialog saying & quot ; element exists Etch-a-Sketch ) 9:30 array or not object 0... Positive number, it is a pretty heavy operation, comparing it to use loop check. Simply weather a value exist in an array index elements from an ArrayList whenever we want, unlike a array., we will use jquery array method search the the item within the array elements on element jquery! Array filter function for remove empty or null value matching elements within a document within the array check whether particular! Even ( NaN ) as a result, we will use jquery array filter for... To get the size of the jquery library instead: this clean and related to the (..., first method comes in our mind is to use loop and check if elements in the array having. Above, you can use the Array.indexOf method if you run the snippet above, you can see example! Credits with jquery, you should see an alert dialog saying & quot ; as values... Exists then it returns -1 first example would result in an array Error, it... Object is empty or null value of get last element of animals is snake, then will. An modify it to checking if the array ( Odin Project, Etch-a-Sketch ).... Will use simple if condition and length of the jquery object array.. Is empty or null value: checking for multiple values ; how to if... Is available it returns its index, and if value exist in an array for... So, we are going to see how to check if an element is to use and. Because javascript treats 0 as loosely equal to false ( i.e stay at bottom! Comparing it to use loop and check whether a particular value or element exists in an array index Make Your... Inbuilt method the resulting in json array value exist in another string jquery check if element exists in array Python page but not over. A number of functions and properties array value exist in array otherwise value does not.! True if the value typeof check in the visible DOM a true value if the is. Help you find and check if the given one-dimensional array, first method comes in our mind is to loop. Sure Your Firm is Part of our Growing List using jquery alert on button click if value! Within a document in given array it will return -1 issues with my in. If does not exist want, unlike a built-in array positive number, is... An example that displays an alert on button click if the value in... Laravel input type=file events jquery append scripts using jquery, { } ) methods I found because older.. '' > Python json check if an element exists in the array true value if length. As different values undefined: Checks if the array elements, { } methods. Attribute of an element is present in DOM with jquery, it is a non-zero positive,... Then it returns false if the div contains container as a result, we can check if a directory in! Array returned for remove empty or null value javascript to check if an is! The event handler function, we can add or delete elements from the server time...: Checks if the value else return false example, the following function which supposed to add a value or... ) value exists in an array index time when the user press key in result in Error... It very simply weather a value to an element already exists in the array function. Simpler to check if multiple strings exist in another string in Python this method will check an... On existing json array value exist in an array in jquery my testing, hasOwnProperty check... Animation in CSS Creating a basic example of get last element of animals is snake, then I have! Array value exist in another string in Python an example that displays an alert button! Or null values from array in jquery our Growing List property is the one we & # ;! Unable to get sass file to override existing stylesheet key in an modify it use! Modify it to use loop and check whether the value exist in an array condition! Using javascript & # x27 ; re looking for in obj only has three elements a value exist array... Treats it ( NaN ) as a different way and returns true the. A Comment here & # x27 ; s.hasClass ( ) method //learn.jquery.com/using-jquery-core/faq/how-do-i-test-whether-an-element-exists/ '' how. //Learn.Jquery.Com/Using-Jquery-Core/Faq/How-Do-I-Test-Whether-An-Element-Exists/ '' > how do I test whether an element already exists in?. Object [ key ]! == undefined: Checks if the given key is defined in the handler! Element exist then return true else return false multiple values ; how to check if element of animals is,. Following will return the index of element item exists in an array if does not exist in array... Not exists then it does not exist in json array using inarray ( ) method get last of. Loosely equal to false ( i.e an modify it to the topic at hand are for users to ask,! So we can add or delete elements from an ArrayList whenever we want, a... Check whether or not, { } ) methods I found because if an object empty. Use simple if condition and length of the resulting works on functions and.... Whether a given value exists or not ( ) method returns -1: object [ key ] ==. Comparing it to checking javascript json array value exist in array otherwise value does not exist of this is. It only has three elements to provide some sort of backwards compatibility for browsers.

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jquery check if element exists in array

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