Js array problem

currently encountered a problem:

it is known that the length of the array is 5, there may be one, two or more values in the array, and the rest of the values want to be filled with "0".
in addition to the methods of the for loop, js has no native methods for arrays to do this.

Javascript
Oct.14,2021 
var arr = new Array(20);
arr[2] = 1;
arr[18] =2 ;
var r = Array.from(arr,(elem) => elem = elem === undefined ? 0 : elem);

try to see if it's what you want

ES5 

var arr = new Array(20);
arr[2] = 1;
arr[18] =2 ;
arr = JSON.parse(JSON.stringify(arr)).map(function (elem) {
  return elem = elem === null ? 0 : elem
});
console.log(arr);

look at

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