JavaScript Syntax Essentials

Minimum constructs

const name = "Anna";       // immutable
let counter = 0;            // mutable

function greet(p) {
  return `Hi, ${p}!`;
}

const people = ["Anna", "Luke"];
for (const p of people) console.log(greet(p));

const user = { name: "Anna", age: 30 };
console.log(user.name);

Prefer const, use let only when you need to reassign. Avoid var.