timepiece/node_modules/es5-ext/array/#/flatten.js

41 lines
963 B
JavaScript

// Stack grow safe implementation
"use strict";
var ensureValue = require("../../object/valid-value")
, isArray = Array.isArray
, objHasOwnProperty = Object.prototype.hasOwnProperty;
module.exports = function () {
var input = ensureValue(this), index = 0, remaining, remainingIndexes, length, i, result = [];
// Jslint: ignore
main: while (input) {
length = input.length;
for (i = index; i < length; ++i) {
if (!objHasOwnProperty.call(input, i)) continue;
if (isArray(input[i])) {
if (i < length - 1) {
// eslint-disable-next-line max-depth
if (!remaining) {
remaining = [];
remainingIndexes = [];
}
remaining.push(input);
remainingIndexes.push(i + 1);
}
input = input[i];
index = 0;
continue main;
}
result.push(input[i]);
}
if (remaining) {
input = remaining.pop();
index = remainingIndexes.pop();
} else {
input = null;
}
}
return result;
};