33 lines
1.3 KiB
JavaScript
33 lines
1.3 KiB
JavaScript
|
var toIndexedObject = require('../internals/to-indexed-object');
|
||
|
|
var toLength = require('../internals/to-length');
|
||
|
|
var toAbsoluteIndex = require('../internals/to-absolute-index');
|
||
|
|
|
||
|
|
// `Array.prototype.{ indexOf, includes }` methods implementation
|
||
|
|
var createMethod = function (IS_INCLUDES) {
|
||
|
|
return function ($this, el, fromIndex) {
|
||
|
|
var O = toIndexedObject($this);
|
||
|
|
var length = toLength(O.length);
|
||
|
|
var index = toAbsoluteIndex(fromIndex, length);
|
||
|
|
var value;
|
||
|
|
// Array#includes uses SameValueZero equality algorithm
|
||
|
|
// eslint-disable-next-line no-self-compare -- NaN check
|
||
|
|
if (IS_INCLUDES && el != el) while (length > index) {
|
||
|
|
value = O[index++];
|
||
|
|
// eslint-disable-next-line no-self-compare -- NaN check
|
||
|
|
if (value != value) return true;
|
||
|
|
// Array#indexOf ignores holes, Array#includes - not
|
||
|
|
} else for (;length > index; index++) {
|
||
|
|
if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
|
||
|
|
} return !IS_INCLUDES && -1;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
// `Array.prototype.includes` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.includes
|
||
|
|
includes: createMethod(true),
|
||
|
|
// `Array.prototype.indexOf` method
|
||
|
|
// https://tc39.es/ecma262/#sec-array.prototype.indexof
|
||
|
|
indexOf: createMethod(false)
|
||
|
|
};
|