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36 lines
1.3 KiB
36 lines
1.3 KiB
3 years ago
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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 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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