why can't you use arrow function with this in javascript for declaring methods
// Normal Function in JavaScript
function Welcome(){
console.log("Normal function");
}
// Arrow Function
const Welcome = () => {
console.log("Normal function");
}
Log in, to leave a comment
4
4
// An empty arrow function returns undefined
let empty = () => {};
(() => 'foobar')();
// Returns "foobar"
// (this is an Immediately Invoked Function Expression)
var simple = a => a > 15 ? 15 : a;
simple(16); // 15
simple(10); // 10
let max = (a, b) => a > b ? a : b;
// Easy array filtering, mapping, ...
var arr = [5, 6, 13, 0, 1, 18, 23];
var sum = arr.reduce((a, b) => a + b);
// 66
var even = arr.filter(v => v % 2 == 0);
// [6, 0, 18]
var double = arr.map(v => v * 2);
// [10, 12, 26, 0, 2, 36, 46]
// More concise promise chains
promise.then(a => {
// ...
}).then(b => {
// ...
});
// Parameterless arrow functions that are visually easier to parse
setTimeout( () => {
console.log('I happen sooner');
setTimeout( () => {
// deeper code
console.log('I happen later');
}, 1);
}, 1);
Thank you!
4
0
4.11
9
const power = (base, exponent) => {
let result = 1;
for (let count = 0; count < exponent; count++) {
result *= base;
}
return result;
};
//if the function got only one parameter
const square1 = (x) => { return x * x; };
const square2 = x => x * x;
// empty parameter
const horn = () => {
console.log("Toot");
};
Thank you!
9
0
3.5
2
'use strict';
var obj = { // does not create a new scope
i: 10,
b: () => console.log(this.i, this),
c: function() {
console.log(this.i, this);
}
}
obj.b(); // prints undefined, Window {...} (or the global object)
obj.c()
Thank you!
2
0
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