Sha256: c70e2ae311d0c980611249ca7c1f570de4a9d30be11652826735e521760b07ed
Contents?: true
Size: 1.9 KB
Versions: 12
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Stored size: 1.9 KB
Contents
'use strict';
var $ = require('../internals/export');
var isObject = require('../internals/is-object');
var isArray = require('../internals/is-array');
var toAbsoluteIndex = require('../internals/to-absolute-index');
var toLength = require('../internals/to-length');
var toIndexedObject = require('../internals/to-indexed-object');
var createProperty = require('../internals/create-property');
var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
var wellKnownSymbol = require('../internals/well-known-symbol');
var SPECIES = wellKnownSymbol('species');
var nativeSlice = [].slice;
var max = Math.max;
// `Array.prototype.slice` method
// https://tc39.github.io/ecma262/#sec-array.prototype.slice
// fallback for not array-like ES3 strings and DOM objects
$({ target: 'Array', proto: true, forced: !arrayMethodHasSpeciesSupport('slice') }, {
slice: function slice(start, end) {
var O = toIndexedObject(this);
var length = toLength(O.length);
var k = toAbsoluteIndex(start, length);
var fin = toAbsoluteIndex(end === undefined ? length : end, length);
// inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
var Constructor, result, n;
if (isArray(O)) {
Constructor = O.constructor;
// cross-realm fallback
if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {
Constructor = undefined;
} else if (isObject(Constructor)) {
Constructor = Constructor[SPECIES];
if (Constructor === null) Constructor = undefined;
}
if (Constructor === Array || Constructor === undefined) {
return nativeSlice.call(O, k, fin);
}
}
result = new (Constructor === undefined ? Array : Constructor)(max(fin - k, 0));
for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);
result.length = n;
return result;
}
});
Version data entries
12 entries across 12 versions & 4 rubygems