element1, …,elementN

Elements used to create the array.

A newArray instance.

The difference betweenArray.of() and theArray() constructor is in the handling of single arguments:Array.of(7) creates an array with a single element,7, whereasArray(7) creates an empty array with alength property of7. (That implies an array of 7 empty slots, not slots with actualundefined values.)

Array.of(7); // [7]Array(7); // array of 7 empty slotsArray.of(1, 2, 3); // [1, 2, 3]Array(1, 2, 3); // [1, 2, 3]

TheArray.of() method is a generic factory method. For example, if a subclass ofArray inherits theof() method, the inheritedof() method will return new instances of the subclass instead ofArray instances. In fact, thethis value can be any constructor function that accepts a single argument representing the length of the new array, and the constructor will be called with the number of arguments passed toof(). The finallength will be set again when all elements are assigned. If thethis value is not a constructor function, the plainArray constructor is used instead.

Theof() method can be called on any constructor function that accepts a single argument representing the length of the new array.

function NotArray(len) {  console.log("NotArray called with length", len);}console.log(Array.of.call(NotArray, 1, 2, 3));// NotArray called with length 3// NotArray { '0': 1, '1': 2, '2': 3, length: 3 }console.log(Array.of.call(Object)); // [Number: 0] { length: 0 }

When thethis value is not a constructor, a plainArray object is returned.

console.log(Array.of.call({}, 1)); // [ 1 ]

• Polyfill ofArray.of incore-js
• es-shims polyfill ofArray.of
• Indexed collections guide
• Array
• Array()
• Array.from()
• TypedArray.of()