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44 lines
1.7 KiB
44 lines
1.7 KiB
'use strict'; |
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var $ = require('../internals/export'); |
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var addToUnscopables = require('../internals/add-to-unscopables'); |
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var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer'); |
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var lengthOfArrayLike = require('../internals/length-of-array-like'); |
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var toAbsoluteIndex = require('../internals/to-absolute-index'); |
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var toIndexedObject = require('../internals/to-indexed-object'); |
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity'); |
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var $Array = Array; |
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var max = Math.max; |
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var min = Math.min; |
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// `Array.prototype.toSpliced` method |
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// https://tc39.es/proposal-change-array-by-copy/#sec-array.prototype.toSpliced |
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$({ target: 'Array', proto: true }, { |
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toSpliced: function toSpliced(start, deleteCount /* , ...items */) { |
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var O = toIndexedObject(this); |
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var len = lengthOfArrayLike(O); |
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var actualStart = toAbsoluteIndex(start, len); |
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var argumentsLength = arguments.length; |
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var k = 0; |
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var insertCount, actualDeleteCount, newLen, A; |
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if (argumentsLength === 0) { |
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insertCount = actualDeleteCount = 0; |
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} else if (argumentsLength === 1) { |
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insertCount = 0; |
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actualDeleteCount = len - actualStart; |
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} else { |
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insertCount = argumentsLength - 2; |
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actualDeleteCount = min(max(toIntegerOrInfinity(deleteCount), 0), len - actualStart); |
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} |
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newLen = doesNotExceedSafeInteger(len + insertCount - actualDeleteCount); |
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A = $Array(newLen); |
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for (; k < actualStart; k++) A[k] = O[k]; |
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for (; k < actualStart + insertCount; k++) A[k] = arguments[k - actualStart + 2]; |
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for (; k < newLen; k++) A[k] = O[k + actualDeleteCount - insertCount]; |
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return A; |
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} |
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}); |
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addToUnscopables('toSpliced');
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