12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 |
- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $TypeError = GetIntrinsic('%TypeError%');
- var MAX_SAFE_INTEGER = require('../helpers/maxSafeInteger');
- var Call = require('./Call');
- var CreateDataPropertyOrThrow = require('./CreateDataPropertyOrThrow');
- var Get = require('./Get');
- var HasProperty = require('./HasProperty');
- var IsArray = require('./IsArray');
- var ToLength = require('./ToLength');
- var ToString = require('./ToString');
- // https://262.ecma-international.org/10.0/#sec-flattenintoarray
- // eslint-disable-next-line max-params
- module.exports = function FlattenIntoArray(target, source, sourceLen, start, depth) {
- var mapperFunction;
- if (arguments.length > 5) {
- mapperFunction = arguments[5];
- }
- var targetIndex = start;
- var sourceIndex = 0;
- while (sourceIndex < sourceLen) {
- var P = ToString(sourceIndex);
- var exists = HasProperty(source, P);
- if (exists === true) {
- var element = Get(source, P);
- if (typeof mapperFunction !== 'undefined') {
- if (arguments.length <= 6) {
- throw new $TypeError('Assertion failed: thisArg is required when mapperFunction is provided');
- }
- element = Call(mapperFunction, arguments[6], [element, sourceIndex, source]);
- }
- var shouldFlatten = false;
- if (depth > 0) {
- shouldFlatten = IsArray(element);
- }
- if (shouldFlatten) {
- var elementLen = ToLength(Get(element, 'length'));
- targetIndex = FlattenIntoArray(target, element, elementLen, targetIndex, depth - 1);
- } else {
- if (targetIndex >= MAX_SAFE_INTEGER) {
- throw new $TypeError('index too large');
- }
- CreateDataPropertyOrThrow(target, ToString(targetIndex), element);
- targetIndex += 1;
- }
- }
- sourceIndex += 1;
- }
- return targetIndex;
- };
|