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What is the most efficient way to create a zero filled JavaScript array of arbitrary length ?
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Use the fill() method to create an array filled with zeros, e.g. new Array(3). fill(0) , creates an array containing 3 elements with the value of 0 . The fill() method sets the elements in an array to the provided value and returns the modified array.
One common way of creating an Array with a given length, is to use the Array constructor: const LEN = 3; const arr = new Array(LEN); assert.
var repeatelem = function(elem, n){ // returns an array with element elem repeated n times. var arr = []; for (var i = 0; i <= n; i++) { arr = arr. concat(elem); }; return arr; }; javascript.
To duplicate an array, just return the element in your map call. numbers = [1, 2, 3]; numbersCopy = numbers. map((x) => x); If you'd like to be a bit more mathematical, (x) => x is called identity.
By default Uint8Array, Uint16Array and Uint32Array classes keep zeros as it's values, so you don't need any complex filling techniques, just:
var ary = new Uint8Array(10); all elements of array ary will be zeros by default.
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