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Even shorter forms
Single-parameter arrows don't need parentheses:
const double = x => x * 2
const greet = name => `Hello, ${name}`
console.log(double(5)) // 10
console.log(greet("Alice")) // Hello, Alice
No parameters still need empty parentheses:
const sayHi = () => "Hi!"
Arrow functions are ideal for short operations, especially as callbacks.