arrow-functions-example.js

const multiply = (a, b) => a * b;

multiply(3, 5);
// output: 15

multiply(2, 40);
// output: 80

// ---------------------------

const filtered = (arr) => arr.filter(val => val > 4);

filtered([1, 2, 3, 4, 5, 6, 7, 8, 9]);
// output: [5, 6, 7, 8, 9]

filtered([1, 2, 3, 4]);
// output: []

// ---------------------------

const double = (arr) => arr.map(val => val * 2);

double([1, 2, 3, 4, 5, 6, 7, 8, 9]);
// output: [2, 4, 6, 8, 10, 12, 14, 16, 18]

// ---------------------------

const isThere = (name) => ["Erik", "Elma", "Muz", "Kavun"].some(val => val === name);

isThere("Elma");
// output: true

isThere("Çilek");
// output: false