arrow function rec
(param1, param2, …, paramN) => { statements }
(param1, param2, …, paramN) => expression
// equivalent to: => { return expression; }
// Parentheses are optional when there's only one parameter name:
(singleParam) => { statements }
singleParam => { statements }
// The parameter list for a function with no parameters should be written with a pair of parentheses.
() => { statements }arrow function
const doSomething = () => {
// Function Scope
};arrow function
const x = (x, y) => { return x * y };arrow function
// Arrow function with two arguments const sum = (firstParam, secondParam) => { return firstParam + secondParam; }; console.log(sum(2,5)); // Prints: 7 // Arrow function with no arguments const printHello = () => { console.log('hello'); }; printHello(); // Prints: hello // Arrow functions with a single argument const checkWeight = weight => { console.log(`Baggage weight : ${weight} kilograms.`); }; checkWeight(25); // Prints: Baggage weight : 25 kilograms. // Concise arrow functionsconst multiply = (a, b) => a * b; console.log(multiply(2, 30)); // Prints: 60arrow function
// Traditional Function
function (a){
return a + 100;
}
// Arrow Function Break Down
// 1. Remove the word "function" and place arrow between the argument and opening body bracket
(a) => {
return a + 100;
}
// 2. Remove the body brackets and word "return" -- the return is implied.
(a) => a + 100;
// 3. Remove the argument parentheses
a => a + 100;arrow function
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