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how to check if an element is in array javascript

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Ashwin Joshy answered on January 13, 2020 Popularity 10/10 Helpfulness 2/10

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how to check if an element is in array javascript

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array.includes('element that need to be checked') //returns true or false

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: element javascript

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Contributed on Oct 14 2022

Ashwin Joshy

0 Answers Avg Quality 2/10

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how to check if an element is in an array javascript

Comment

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.includes("Mango");

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: element

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Contributed on Jan 28 2022

Zany Zebra

0 Answers Avg Quality 2/10

how to check if item is in list js

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var myList=["a", "b", "c"];
mylist.includes("d")//returns true or false

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 13 2020

Combative Centipede

0 Answers Avg Quality 2/10

How do I check if an array includes a value in JavaScript?

Comment

Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE:

console.log(['joe', 'jane', 'mary'].includes('jane')); //true

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Mar 15 2022

shafeeque

0 Answers Avg Quality 2/10

javascript check if in array

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var extensions = ["image/jpeg","image/png","image/gif"];          
if(extensions.indexOf("myfiletype") === -1){
	alert("Image must be .png, .jpg or .gif");
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 13 2020

Friendly Hawk

0 Answers Avg Quality 2/10

javascript check if array is in array

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var array = [1, 3],
    prizes = [[1, 3], [1, 4]],
    includes = prizes.some(a => array.every((v, i) => v === a[i]));

console.log(includes);

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Source: stackoverflow.com

Tags: javascript j

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Contributed on Jun 29 2020

Prafy

0 Answers Avg Quality 2/10

check items in array javascript

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function checkAllEven(arr) {
  return arr.every(function(x){
	 return	x % 2 === 0
	})
}

//using "every" to check every item in array.

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Source: Grepper

Tags: items item

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Contributed on Feb 23 2020

Panicky Polecat

0 Answers Avg Quality 2/10

javascript - Determine whether an array contains a value

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var contains = function(needle) {
    // Per spec, the way to identify NaN is that it is not equal to itself
    var findNaN = needle !== needle;
    var indexOf;

    if(!findNaN && typeof Array.prototype.indexOf === 'function') {
        indexOf = Array.prototype.indexOf;
    } else {
        indexOf = function(needle) {
            var i = -1, index = -1;

            for(i = 0; i < this.length; i++) {
                var item = this[i];

                if((findNaN && item !== item) || item === needle) {
                    index = i;
                    break;
                }
            }

            return index;
        };
    }

    return indexOf.call(this, needle) > -1;
};

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Source: worcraft-algeria-dz.com

Tags: contains contain

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Contributed on Aug 01 2022

thecodeteacher

0 Answers Avg Quality 2/10

check if item is in array

Comment

-1

console.log(myArray.indexOf('three') > -1);
console.log(myArray.includes('three'));

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: stackoverflow.com

Tags: typescript t

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Contributed on Jul 01 2023

Thebetta

0 Answers Avg Quality 2/10

how to check if an element is in array javascript

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