Kwado:

JavaScript Map has()

Bayani da Amfani has()

Hanyar yana amfani da suka nazarin kwarara Map domin samun abin da ke cikin, idan abin ya wuce samu true.

Tukuru 1

// Ana kafa Map
const fruits = new Map([
  ["apples", 500],
  ["bananas", 300],
  ["oranges", 200]
]);
// Ka da 'apples' ke cikin Map?
fruits.has("apples");

Sai ka ci gaba

Tukuru 2

Daina koyar da a fi wuce:

fruits.delete("apples");
fruits.has("apples");

Sai ka ci gaba

Lanar da ke kwarewa

Parameter

Daga a samu

Tsaro browser

map.has() Wannan shi amincin ECMAScript6 (ES6).

Daga 2017 Sanu 6, dukiyyar browser dama gani sukar da suka kewaye ES6 (JavaScript 2015):

map.has() 在 Internet Explorer 中不受支持。