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