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Different syntaxes
Convert traditional functions to arrows:
// Traditional
function double(x) { return x * 2 }
function greet(name) { return "Hello, " + name }
function sum(a, b) { return a + b }
// Arrow
const double = x => x * 2
const greet = name => "Hello, " + name
const sum = (a, b) => a + b
Practice both styles. Use arrows for short functions, traditional for longer ones.