if / else if / else. A ternary is a one-line choice.

Goal

Label a kiosk busy or quiet.

const units = 12;
if (units >= 10) {
  console.log("busy");
} else {
  console.log("quiet");
}

const city = "Mombasa";
if (city === "Nairobi") {
  console.log("capital");
} else if (city === "Mombasa") {
  console.log("coast");
} else {
  console.log("other");
}

const units = 5;
console.log(units >= 10 ? "busy" : "quiet");

const n = 0;
if (n) {
  console.log("truthy");
} else {
  console.log("falsy");
}