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javascript Array.isArray

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Yellowed Yak answered on July 22, 2019 Popularity 10/10 Helpfulness 4/10

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javascript Array.isArray

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// all following calls return true
Array.isArray([]);
Array.isArray([1]);
Array.isArray(new Array());
Array.isArray(new Array('a', 'b', 'c', 'd'));
Array.isArray(new Array(3));
// Little known fact: Array.prototype itself is an array:
Array.isArray(Array.prototype);

// all following calls return false
Array.isArray();
Array.isArray({});
Array.isArray(null);
Array.isArray(undefined);
Array.isArray(17);
Array.isArray('Array');
Array.isArray(true);
Array.isArray(false);
Array.isArray(new Uint8Array(32));
Array.isArray({ __proto__: Array.prototype });

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: javascript

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Contributed on Jul 29 2022

Yellowed Yak

0 Answers Avg Quality 2/10

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javascript check if is array

Comment

var colors=["red","green","blue"];

if(Array.isArray(colors)){
    //colors is an array
}

Popularity 10/10 Helpfulness 7/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 22 2019

Grepper

0 Answers Avg Quality 2/10

js is array

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Array.isArray([1, 2, 3]);   // true
Array.isArray({toto: 123}); // false
Array.isArray("tototruc");  // false
Array.isArray(undefined);   // false

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jan 01 2022

Bloody Batfish

0 Answers Avg Quality 2/10

js check if is array

Comment

if(Array.isArray(colors)){
    //colors is an array
}

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Dec 30 2020

Lazy Lion

0 Answers Avg Quality 2/10

check if is array javascript

Comment

if(Object.prototype.toString.call(someVar) === '[object Array]') {
    alert('Array!');
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Sep 19 2021

Helpless Herring

0 Answers Avg Quality 2/10

javascript Array.isArray

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