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javascript - Determine whether an array contains a value

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thecodeteacher answered on January 13, 2020 Popularity 10/10 Helpfulness 1/10

answer javascript - Determine whether an array contains a value

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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 javascript

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Contributed on Aug 01 2022

thecodeteacher

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 7/10 Language javascript

Source: Grepper

Tags: element

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Contributed on Jan 28 2022

Zany Zebra

0 Answers Avg Quality 2/10

check if array does not contain value javascript

Comment

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango"); // true

var n = fruits.includes("Django"); // false

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: contain

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Contributed on Jan 09 2021

Vivacious Vendace

0 Answers Avg Quality 2/10

Check if an array contains a number in javascript

Comment

const ratings = [1,2,3,4,5];

let result = ratings.includes(4); 
console.log(result); // true

result = ratings.includes(6); 
console.log(result); // false

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Source: softhunt.net

Tags: contains contain

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Contributed on Apr 06 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

js check if array contains value

Comment

var arr = ["name", "id"];
  if (arr.indexOf("name") > -1) console.log('yeah');
  else console.log('nah');

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Source: Grepper

Tags: contains contain

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Contributed on Jun 01 2022

yishay cooper

0 Answers Avg Quality 2/10

check if array have "false" value using "includes"

Comment

if (validation.includes(value)) {
    // ... your code
}

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Source: stackoverflow.com

Tags: javascript j

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Contributed on May 08 2021

Confused Caiman

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 4/10 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

Comment

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

Check if value is array

Comment

Method 1: Using the isArray method
Array.isArray(variableName)'

Method 2:
variable instanceof Array

Method 3:
variable.constructor === Array

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Source: www.codegrepper.com

Tags: instance instanc

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Contributed on May 05 2022

Samiksha Singla

0 Answers Avg Quality 2/10

Check if an array contains a number in javascript

Comment

const ratings = [1,2,3,4,5];

let result = ratings.includes(4); 
console.log(result); // true

result = ratings.includes(6); 
console.log(result); // false

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: softhunt.net

Tags: contains contain

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Contributed on Apr 06 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

js check if array contains value

Comment

return arrValues.indexOf('Sam') > -1

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: contains contain

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Contributed on Oct 13 2021

Borma

0 Answers Avg Quality 2/10

javascript - Determine whether an array contains a value

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javascript - Determine whether an array contains a value

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

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