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- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var toAbsoluteIndex = require('../internals/to-absolute-index');
- var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
- var $TypeError = TypeError;
- var max = Math.max;
- var min = Math.min;
- var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
- // https://tc39.es/proposal-change-array-by-copy/#sec-array.prototype.toSpliced
- // https://tc39.es/proposal-change-array-by-copy/#sec-%typedarray%.prototype.toSpliced
- module.exports = function (O, C, args) {
- var start = args[0];
- var deleteCount = args[1];
- var len = lengthOfArrayLike(O);
- var actualStart = toAbsoluteIndex(start, len);
- var argumentsLength = args.length;
- var k = 0;
- var insertCount, actualDeleteCount, newLen, A;
- if (argumentsLength === 0) {
- insertCount = actualDeleteCount = 0;
- } else if (argumentsLength === 1) {
- insertCount = 0;
- actualDeleteCount = len - actualStart;
- } else {
- insertCount = argumentsLength - 2;
- actualDeleteCount = min(max(toIntegerOrInfinity(deleteCount), 0), len - actualStart);
- }
- newLen = len + insertCount - actualDeleteCount;
- if (newLen > MAX_SAFE_INTEGER) throw $TypeError('Maximum allowed length exceeded');
- A = new C(newLen);
- for (; k < actualStart; k++) A[k] = O[k];
- for (; k < actualStart + insertCount; k++) A[k] = args[k - actualStart + 2];
- for (; k < newLen; k++) A[k] = O[k + actualDeleteCount - insertCount];
- return A;
- };
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