71 lines
2.8 KiB
JavaScript
71 lines
2.8 KiB
JavaScript
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'use strict';
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var $ = require('../internals/export');
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var toAbsoluteIndex = require('../internals/to-absolute-index');
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var toInteger = require('../internals/to-integer');
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var toLength = require('../internals/to-length');
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var toObject = require('../internals/to-object');
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var arraySpeciesCreate = require('../internals/array-species-create');
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var createProperty = require('../internals/create-property');
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var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
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var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
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var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('splice');
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var USES_TO_LENGTH = arrayMethodUsesToLength('splice', { ACCESSORS: true, 0: 0, 1: 2 });
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var max = Math.max;
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var min = Math.min;
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var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
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var MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded';
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// `Array.prototype.splice` method
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// https://tc39.github.io/ecma262/#sec-array.prototype.splice
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// with adding support of @@species
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$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {
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splice: function splice(start, deleteCount /* , ...items */) {
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var O = toObject(this);
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var len = toLength(O.length);
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var actualStart = toAbsoluteIndex(start, len);
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var argumentsLength = arguments.length;
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var insertCount, actualDeleteCount, A, k, from, to;
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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(toInteger(deleteCount), 0), len - actualStart);
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}
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if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER) {
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throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);
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}
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A = arraySpeciesCreate(O, actualDeleteCount);
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for (k = 0; k < actualDeleteCount; k++) {
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from = actualStart + k;
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if (from in O) createProperty(A, k, O[from]);
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}
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A.length = actualDeleteCount;
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if (insertCount < actualDeleteCount) {
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for (k = actualStart; k < len - actualDeleteCount; k++) {
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from = k + actualDeleteCount;
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to = k + insertCount;
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if (from in O) O[to] = O[from];
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else delete O[to];
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}
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for (k = len; k > len - actualDeleteCount + insertCount; k--) delete O[k - 1];
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} else if (insertCount > actualDeleteCount) {
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for (k = len - actualDeleteCount; k > actualStart; k--) {
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from = k + actualDeleteCount - 1;
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to = k + insertCount - 1;
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if (from in O) O[to] = O[from];
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else delete O[to];
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}
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}
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for (k = 0; k < insertCount; k++) {
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O[k + actualStart] = arguments[k + 2];
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}
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O.length = len - actualDeleteCount + insertCount;
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return A;
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}
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});
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