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javascript check if in array

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Friendly Hawk answered on January 13, 2020 Popularity 10/10 Helpfulness 3/10

answer javascript check if in array

related how to check if an element is in an array javascript

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

related Check array contains element

related How to Check if an Item is in an Array in JavaScript Using Array.includes()

related how to check if an element is in array javascript

related javascript check if array is in array

related how to check if array contains an item javascript

related check items in array javascript

related javascript - Determine whether an array contains a value

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

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Contributed on Jan 13 2020

Friendly Hawk

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

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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

Check array contains element

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Check array contains element
String[] fruits = new String[] { "banana", "guava", "apple", "cheeku" };

Arrays.asList(fruits).contains("apple"); // true
Arrays.asList(fruits).indexOf("apple"); // 2

Arrays.asList(fruits).contains("lion"); // false
Arrays.asList(fruits).indexOf("lion"); // -1

Popularity 9/10 Helpfulness 3/10 Language java

Source: howtodoinjava.com

Tags: contains contain

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Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

How to Check if an Item is in an Array in JavaScript Using Array.includes()

Comment

const nums = [ 1, 3, 5, 7];
console.log(nums.includes(3));
// true

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Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Jun 29 2022

OHIOLee

0 Answers Avg Quality 2/10

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

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Source: Grepper

Tags: element

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Contributed on Oct 14 2022

Ashwin Joshy

0 Answers Avg Quality 2/10

javascript check if array is in array

Comment

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

console.log(includes);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jun 29 2020

Prafy

0 Answers Avg Quality 2/10

how to check if array contains an item javascript

Comment

let isInArray = arr.includes(valueToFind[, fromIndex])
// arr         - array we're inspecting
// valueToFind - value we're looking for
// fromIndex   - index from which the seach will start (defaults to 0 if left out)
// isInArray   - boolean value which tells us if arr contains valueToFind

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Source: stackabuse.com

Tags: contains contain

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Contributed on Aug 15 2022

Hakor

0 Answers Avg Quality 2/10

check items in array javascript

Comment

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

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

Popularity 10/10 Helpfulness 1/10 Language javascript

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

Comment

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

javascript check if in array

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javascript check if in array

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

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how to check if an element is in array javascript

javascript check if array is in array

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javascript - Determine whether an array contains a value

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