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LeetCode/js/filter-elements-from-array.js

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/**
* @param {number[]} arr
* @param {Function} fn
* @return {number[]}
*/
var filter = function(arr, fn) {
let new_arr = new Array();
let i = 0;
for (let x of arr) {
if (fn(x, i++)) {
new_arr.push(x);
}
}
return new_arr;
};