// Normal Function
let add = function (num1, num2) {
return num1 + num2;
}
// Arrow Function
let add = (num1, num2) => num1 + num2;Regular functions created through function declarations / expressions are both constructible and callable. ... Arrow functions (and methods) are only callable i.e arrow functions can never be used as constructor functions. Hence, they can never be invoked with the new keyword.const add3 = (num1, num2, num3) => return num1 + num2 + num3;
const sayHi = ()=>console.log('Hi');
const square = num => num ** 2;
// currently common pattern
var that = this;
getData(function(data) {
that.data = data;
});
// better alternative with arrow functions
getData(data => {
this.data = data;
});