Alternative or polyfill for Array.from on the Internet Explorer

Question

I have a problem with my Angular App on the Internet Explorer. It runs everywhere without a problem (Chrome, Mozilla, Edge), but on on the IE.

I have analyzed with th

Answer 1

I faced the same issue. Looked at the polyfill and it is threatening huge. Here is 2 lines short solution.

The OP basically needs to create simple array from his array-like object. I used to my taste the most efficient 2 lines plain for loop (I had to make array from HTML DOM nodelist array-like object, same applicable to JavaScript arguments object).

For the OP's case it could sound this way:

var temp_array = [],
    length = tmp.length;

for (var i = 0; i < length; i++) {
    temp_array.push(tmp[i]);
}

// Here you get the normal array "temp_array" containing all items
// from your `tmp` Set.

Make it separate function and you get 3 lines universal reusable solution for the IE<9 case.

Here is how the separate function may look like:

/**
 * @param arr The array | array-like data structure.
 * @param callback The function to process each element in the 'arr'.
 * The callback signature and usage is assumed similar to the 
 * native JS 'forEach' callback argument usage.
 */
function customEach(arr, callback) {
    'use strict';
    var l = arr.length;
    for (var i = 0; i < l; i++) {
        callback(arr[i], i, arr);
    }
};

PS: here is the relevant description for forEach callback to see how to use the customEach callback.