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array includes

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Array-Includes

Ein ES7/ES2016 Spec-konforme Array.prototype.includes

Dieses Paket implementiert die ES-Shim-API-Schnittstelle. Es arbeitet in einer von ES3 unterstützten Umgebung und entspricht der vorgeschlagenen Spezifikation.

Da Array.prototype.includes von einem Empfänger ( this Wert) abhängt, erfordert der Hauptexport das Array als erstes Argument.

Zu den Motoren, die dieses Paket benötigen, gehören:

Dh (alle Versionen)
Safari <9
Firefox <43 und 99-101
Chrom <47
Rand <14
Knoten <6

Erste Schritte

npm install --save array-includes

Verwendung

Grundlegende Verwendung: Inklusive (Array, Wert [, von INDEX = 0])

 var includes = require ( 'array-includes' ) ;
var assert = require ( 'assert' ) ;
var arr = [ 'one' , 'two' ] ;

includes ( arr , 'one' ) ; // true
includes ( arr , 'three' ) ; // false
includes ( arr , 'one' , 1 ) ; // false

Beispiel

 var arr = [
	1 ,
	'foo' ,
	NaN ,
	- 0
] ;

assert . equal ( arr . indexOf ( 0 ) > - 1 , true ) ;
assert . equal ( arr . indexOf ( - 0 ) > - 1 , true ) ;
assert . equal ( includes ( arr , 0 ) , true ) ;
assert . equal ( includes ( arr , - 0 ) , true ) ;

assert . equal ( arr . indexOf ( NaN ) > - 1 , false ) ;
assert . equal ( includes ( arr , NaN ) , true ) ;

assert . equal ( includes ( arr , 'foo' , 0 ) , true ) ;
assert . equal ( includes ( arr , 'foo' , 1 ) , true ) ;
assert . equal ( includes ( arr , 'foo' , 2 ) , false ) ;

 /* when Array#includes is not present */
delete Array . prototype . includes ;
var shimmedIncludes = includes . shim ( ) ;

assert . equal ( shimmedIncludes , includes . getPolyfill ( ) ) ;
assert . equal ( arr . includes ( 'foo' , 1 ) , includes ( arr , 'foo' , 1 ) ) ;

 /* when Array#includes is present */
var shimmedIncludes = includes . shim ( ) ;

assert . equal ( shimmedIncludes , Array . prototype . includes ) ;
assert . equal ( arr . includes ( 1 , 'foo' ) , includes ( arr , 1 , 'foo' ) ) ;