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rated 0 times [ 179] [ 5] / answers: 1 / hits: 28956 / 8 Years ago, tue, february 23, 2016, 12:00:00

I was toying a bit and was trying to instantiate a new array of length x, where all elements of that array were initialized to a value y:

var arr = new Array(x).fill(y);

This works well if the value of y is anything other than an object.
Meaning that if y is an object, the following is true:

var arr = new Array(2).fill({});

arr[0] === arr[1]; //is true;

arr[0].test = 'string';

arr[1].test === 'string'; //is also true;

Is there any way to state that a new object should be created for each element while using the fill-function? Or should I just convert it to a loop?

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3 Years ago

answered 8 Years ago jadyngraysons · Accepted Answer

You can first fill the array with any value (e.g. undefined), and then you will be able to use map:

var arr = new Array(2).fill().map(u => ({}));

var arr = new Array(2).fill().map(Object);