JavaScript

Create a formatted message from object values.

const user = {
  name: "Mira",
  score: 128,
};

const message = `${user.name}: ${user.score} points`;
console.log(message);

Filter active records and return their names.

const users = [
  { name: "Ari", active: true },
  { name: "Bea", active: false },
  { name: "Kai", active: true },
];

const names = users
  .filter((user) => user.active)
  .map((user) => user.name);

Use a closure to retain a private counter value.

function createCounter(start = 0) {
  let value = start;

  return () => {
    value += 1;
    return value;
  };
}

const next = createCounter(3);