heyujie
2021-06-07 8f8155aa4c83f7c2577ac123add550766b6a7ce3
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// 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;
};