Chain multiple conditions with else if:
let score = 85
if (score >= 90) {
console.log("A")
} else if (score >= 80) {
console.log("B")
} else if (score >= 70) {
console.log("C")
} else {
console.log("F")
}
Conditions are checked top to bottom. The first true condition runs, and the rest are skipped. Order matters when ranges overlap.