list-flatten/index.js

Flatten an array or array-like list (non-recursive implementation).

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = flatten;

require('babel-polyfill');

function flatten(array) {
    var currentArray = Array.from(array); // ES2015, in case we pass an array-like thing.
    var breadcrumbs = [];
    var result = [];

    var i = 0;
    while (currentArray) {

        if (currentArray[i] instanceof Array) {
            breadcrumbs.push({ currentArray: currentArray, i: i });
            currentArray = currentArray[i];
            i = -1;
        } else {
            result.push(currentArray[i]);
        }

        var crumb = null;
        while (currentArray && i === currentArray.length - 1) {
            crumb = breadcrumbs.pop();
            currentArray = crumb ? crumb.currentArray : null;
            i = crumb ? crumb.i : null;
        }

        i += 1;
    }

    return result;
}
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