Identifying Array Object

 

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  • How do you check if a variable is an array in JavaScript? [duplicate] 24 answers
  • Check if object is array? 38 answers

    • In pure JavaScript you can use the following cross browser approach: 

    if (Object.prototype.toString.call(x) === "[object Array]") {
    // is plain array
}

    jQuery has special method for that: 

    if ($.isArray(x)) {
    // is plain array
}

    You can use instanceof . Here's some FireBug testing: 

    test1 = new Object();
test2 = new Array();
test3 = 123;

console.log(test1 instanceof Array); //false
console.log(test2 instanceof Array); //true
console.log(test3 instanceof Array); //false

    Best practice is the invocation of Object.prototype.toString() on the target object, which displays the internal [[Class]] property name. 

    Object.prototype.toString.call( x ); // [object Array]

    This has the adventage, that it works on any and every object, regardless of if you're working in a multi frame / window environment, which causes problems on using x instanceof Array .

    Newer ES5 implementations, also give you the method Arrays.isArray() , which returns true or false . 

    Array.isArray( x ); // true

    And last but not least, jQuery has its very own .isArray() method, which also returns a boolean 

    jQuery.isArray( x ); // true
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