how to check if an element already exists in an array in javascript

Solutions on MaxInterview for how to check if an element already exists in an array in javascript by the best coders in the world

Search
showing results for - "how to check if an element already exists in an array in javascript"
César
01 Jan 2019
1function includes(arrayOfArrays, item) {
2    let array, i, j;
3    for(i=0; i<arrayOfArrays.length; ++i) {
4        array = arrayOfArrays[i];
5        for(j=0; j<array.length; ++j) {
6            if(array[j] === item) {
7                return true;
8            }
9        }
10    }
11    return false;
12}
Issam
25 May 2018
1private boolean ZitAlInArray(int value, List<Integer> list) {
2  return array.indexOf(value) > -1;
3}
4
5private boolean zitAlInArray(int[] array, int index) {
6		for (int i = 0; i < index; i++) {
7			if (array[i] == array[index]) {
8				return true;
9			}
10		} 
11		return false;
12	}
13
similar questions
get if there is a value in an array node jscheck if array exists in another array javascriptloop array and check if value matches in jsjavascript method to see if item exists in arrayhow to check if item is in list jschecking whether a value exists in an array javascriptcheck if a element exists in array javascriptappend to array check if exists javascriptjavascript check if elements of one array are in anotherjs add to array if not existscheck value exist in array javascriptcheck if array does not contain value javascriptcheck if all elements in array match a condition javascriptjs push into array if item exist
queries leading to this page
check if value already exists in array javascriptsee if an element is included in an array jshow to check array has value or not in javascriptcheck if element already exsit in array jschecking whether a value exists in an array javascripthow to check if an element is there in a list javascripthow to check if a value is already in an array javascriptjs find and return if element exists in arrayjavascript check if element exists in arrayjavascript array contains return stringhow to check if a element already in the array javascriptcheck if item is array alreeady existshow to check if an id already exists in an array javascriptcheck if dom element already is in arraycheck if value is in arraycheck if not in array js e2 80 9chow to check if an element already exists in an array jscheck if array contains texthow to check if any word in an array is inside a string javascript e2 80 9chow to check if an element already exists in an array in javascript e2 80 9d code answer e2 80 99show to check if a value in the array or not javascriptjavascript check if integer exist in an arraycheck ifelement in list jscheck if string array contain string jscheck any value conrains in array javascriptcheck in array if value already exists javascriptjavascript check if array has already valuecheck if value is key or value array javascripthow to see if data matches array javascriptjavascript check if value exist in arraycheck if value in array alreadycheck if value already exist in arrayjavascript check that an array doesn 27t contain a valuejavascript check if element already exists in arrayget value from array javascript if you are unsure the index existscheck if array has certain value javascriptfind array has in jshow to check if an element already exists in an array in javascriptif in array value matchjs check is string present in arrayif value in array is something return true javascriptlook if a id exists in array jsjavascript see if array includes true valuesjs check if array of type contains stringhow to get true if a value exists in javascriptcheck if a string is present in an array jsif statement to check if element is already part of arrayhow to check if some data already exists in array javascripthow to chech if an item exist in an arraycheck if field of array have value jshow to check if a certain value is inside an arrayjavascript find if element exists in arraycheck if the value is present in both arraycheck if an element exists in an array javascriptarray check if already existcheck if array does not contain value javascriptcheck if array element is string javascriptchecking if a value exists in arraycheck if array exists before finddetermine wheter or not a value is in an arrayjs if value exist in arrrayif the same value is present in array javascriptif in array element jshow to check which element doesn 27t exist in an arraycheck array has any number value jshow to check if element exists twice in array javascripthow to check if element is already present in an array javascriptcheck if string exists in arrayhow to get the array number if it has a certain value jscheck if value exists in arrayjs check if element of list contains valuecheck if item already exists in array javascriptjavascript if inside arrayjs how to check if element is not in arraycheck if a value is in arrayhow to check whether the letter is there in the array or no jvascriptjs check if something in array already existscheck element present in array javascriptjavascript if is included in arrayhow to check if any number in array is not validcheck if the array has already that value ifcheck if array already has an item in 2c jscheck afray has certain elementcheck to see if there is a value in array javascriptdetect if string is in list javascriptjavascript see if array includes true node js check if not in arrayhow to check if item exists in array javascripthow to check if something exists in javascript arrayjavascript check if number is already in arraycheck if item in number list javascriptcheck if element exists in array javascriptjs array includes returncheck if element is already in array javascriptto check whether a name is included in an array in javascripthow to check if an item already exists in an array javascriptcheck array for presence of value javascriptcheck if array includes specific key value javascripthow to check if an array already contains a valueif element is present in js array searchcheck if an array is strings jsjavascript does thing exist in arraycheck if an element exists in js arraycheck if item already exists in array jsjavascript how to check if an item in array does not match valuecheck if array has similar values javascriptcheck if item is found in arraycheck if data has in javascript arrayhow to check element is not present in array with include in javascriptarray check if an element existshow to check if an array contains a valuecheck if a name is in a list jsjavascript array already existshow to check if an array contains a string in javascriptif array does not contain javascriptif value is in array jsdetermine if item is in array jsif array element containshow to check if array contain this valuehow to check exists of value in array list javascriptjavascript check if in array value existdo not check element in array if already seenarray check if value existsjavascript return true if element exists in array if already available in array javascriptcheck if already an element of an array jshow to check array exist in javasriptjs check if any element i array how to check if a character is included in an array javascriptverify item existi in array javascriptjavascript check if list includes stringhow to find if an element is in an array 3fjavascript check if item already exists in arraycheck if something exists in list javascripthow to check wheather a string array is contains number or not javascripthow to check if word in a array jshow to check if there is an item already in array jshow to check if a element already in te array javascripthow to check if an array has valueshow to check if a list contains a value in javascriptcheck if array exists javascriptcheck if element is on arrayif ele is in array in jscheck if array includes integer jsjs check if element in array existscheck if item is already in array javascriptcheck if array item existsif array containshow to check if a number already exists in an array javascripthow to check if a list contains something jshow to check if an value is not in arrayjavascript how to check if number already exists in arraymake an array which checks if the item already exists in that arrayto check if element already exist in array javascriptjavascript check of something is in a arayfind if element object exists in array javascriptcheck if a list containes an item jssee if id already exits in a array javascriptcheck if element is in arrayhow to check the apperence of the element in an arraycheck if element not in arrayhow to check in array value is it string javascripthow to return true if array has valueif array contains value return truehow to check if array value start with in javascriptjavascript array how to check if an element existshow to check a specific amount from an array in javascriptjs check if element exists in arraycheck if item already in arrayhow to check if id is not already present in an array value javascripthow to check if an element already in the array javascriptjavascript check if item in array existscheck if array includes character javascripthow to check if there is an item already in arrayto check if element already exist in arraycheck if integer already in list jscheck existing in arrayknow if a element is in a array jshow to check whether the letter is there in the array or no javascriptjavascript check if an element exists in an arrayhow to check if an array holds a value jscheck if element already exists in array javascriptcheck a value exist in array of arrayjavascript see if array has a true valuecheck if a data exist in a array jshow to see if an array contains a value in node jshow to check if an item exists inside an arrayif array includes functionhow ot chedck if an array has an elementhow to check an array if it has valuesjs find if value exists in arrayhow to check if array contains a string in jshow to check given item is already in arrayhow to check if any one value is something in an arrayif already in arraycheck if element exists twice in arrayif a div already exists in array javascripthow to check if a element already in te arrayhow to know if array contains a valuecheck if the element is already in the array javascripthow can you check if a string is in the arraycheck if an array contains a numberjs find if a number is already in arraycheck if an elemet is already in the array angularjavascript check if array does not contains object with specific valuecheck if an element is in an arrayhow to find the number in exist in array in javascripthow to find a array is present in list of array js 27how to check if array contains a elementjavascript how to check element exists in arraysee if item in list jsnodejs check if only some element exists in arrayhow to check if an array exists in javascripthow to check if a stirng exists in an array in javascripthow to find out the element is already exist in the array javascripthow to check if value already exists in array in javascriptif term in arraydetect if item exist in array javascripthow to check if value already exist in array in javascriptcheck if already exists in array javascriptif array had specific value javascriptcheck if value is already present in array of arrray javascriptjavascript check if an array contains a part of a value e2 80 9chow to check if an element already exists in an arrayjs check if element exists in array 5dcheck if value exists in array javascriptjavascript check if entry in listchecking a value in an array jshow to check if an element already exists in an array in javascript