"use strict";
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var iteratorSymbol = require("es6-symbol").iterator
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, isArguments = require("../../function/is-arguments")
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, isFunction = require("../../function/is-function")
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, toPosInt = require("../../number/to-pos-integer")
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, callable = require("../../object/valid-callable")
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, validValue = require("../../object/valid-value")
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, isValue = require("../../object/is-value")
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, isString = require("../../string/is-string")
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, isArray = Array.isArray
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, call = Function.prototype.call
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, desc = { configurable: true, enumerable: true, writable: true, value: null }
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, defineProperty = Object.defineProperty;
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// eslint-disable-next-line complexity, max-lines-per-function
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module.exports = function (arrayLike/*, mapFn, thisArg*/) {
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var mapFn = arguments[1]
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, thisArg = arguments[2]
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, Context
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, i
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, j
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, arr
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, length
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, code
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, iterator
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, result
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, getIterator
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, value;
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arrayLike = Object(validValue(arrayLike));
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if (isValue(mapFn)) callable(mapFn);
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if (!this || this === Array || !isFunction(this)) {
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// Result: Plain array
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if (!mapFn) {
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if (isArguments(arrayLike)) {
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// Source: Arguments
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length = arrayLike.length;
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if (length !== 1) return Array.apply(null, arrayLike);
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arr = new Array(1);
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arr[0] = arrayLike[0];
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return arr;
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}
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if (isArray(arrayLike)) {
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// Source: Array
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arr = new Array((length = arrayLike.length));
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for (i = 0; i < length; ++i) arr[i] = arrayLike[i];
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return arr;
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}
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}
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arr = [];
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} else {
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// Result: Non plain array
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Context = this;
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}
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if (!isArray(arrayLike)) {
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if ((getIterator = arrayLike[iteratorSymbol]) !== undefined) {
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// Source: Iterator
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iterator = callable(getIterator).call(arrayLike);
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if (Context) arr = new Context();
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result = iterator.next();
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i = 0;
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while (!result.done) {
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value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
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if (Context) {
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desc.value = value;
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defineProperty(arr, i, desc);
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} else {
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arr[i] = value;
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}
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result = iterator.next();
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++i;
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}
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length = i;
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} else if (isString(arrayLike)) {
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// Source: String
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length = arrayLike.length;
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if (Context) arr = new Context();
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for (i = 0, j = 0; i < length; ++i) {
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value = arrayLike[i];
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if (i + 1 < length) {
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code = value.charCodeAt(0);
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// eslint-disable-next-line max-depth
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if (code >= 0xd800 && code <= 0xdbff) value += arrayLike[++i];
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}
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value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
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if (Context) {
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desc.value = value;
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defineProperty(arr, j, desc);
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} else {
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arr[j] = value;
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}
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++j;
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}
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length = j;
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}
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}
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if (length === undefined) {
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// Source: array or array-like
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length = toPosInt(arrayLike.length);
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if (Context) arr = new Context(length);
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for (i = 0; i < length; ++i) {
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value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
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if (Context) {
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desc.value = value;
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defineProperty(arr, i, desc);
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} else {
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arr[i] = value;
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}
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}
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}
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if (Context) {
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desc.value = null;
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arr.length = length;
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}
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return arr;
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};
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