Build login validation:
let username = "alice"
let password = "secret123"
let isLocked = false
let attempts = 2
if (isLocked) {
console.log("Account locked")
} else if (!username || !password) {
console.log("Enter username and password")
} else if (attempts >= 3) {
console.log("Too many attempts")
} else if (username === "alice" && password === "secret123") {
console.log("Login successful")
} else {
console.log("Invalid credentials")
}