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