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45 lines
1.7 KiB
45 lines
1.7 KiB
2 years ago
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'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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