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35 lines
1.3 KiB
35 lines
1.3 KiB
var lengthOfArrayLike = require('../internals/length-of-array-like'); |
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var toAbsoluteIndex = require('../internals/to-absolute-index'); |
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity'); |
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var max = Math.max; |
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var min = Math.min; |
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// https://tc39.es/proposal-change-array-by-copy/#sec-array.prototype.toSpliced |
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// https://tc39.es/proposal-change-array-by-copy/#sec-%typedarray%.prototype.toSpliced |
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module.exports = function (O, C, args) { |
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var start = args[0]; |
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var deleteCount = args[1]; |
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var len = lengthOfArrayLike(O); |
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var actualStart = toAbsoluteIndex(start, len); |
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var argumentsLength = args.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 = len + insertCount - actualDeleteCount; |
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A = new C(newLen); |
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for (; k < actualStart; k++) A[k] = O[k]; |
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for (; k < actualStart + insertCount; k++) A[k] = args[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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