JS Arrow против нормальной функции
// jsdrops.com/arrow-functions
this.whoIsThis = 'TOP'; // Identify this scope
// 1) Defining
const fancyObj {
whoIsThis: 'FANCY', // Identify this object
regularF: function () {
console.log('regularF', this.whoIsThis);
},
arrowF: () => {
console.log('arrowF', this.whoIsThis);
},
};
// 2) Calling
console.log('TOP-LEVEL', this.whoIsThis); // It's "TOP" here
fancyObj.regularF(); // Output #1 (Fancy)
fancyObj.arrowF(); // Output #2 (Top)
fancyObj.regularF.call({whoIsThis: 'FAKE'}); // Output #3 (Fake)
fancyObj.arrowF.call({whoIsThis: 'FAKE'}); // Output #4 (Top)
Puzzled Puffin
