Practice array operations:
let numbers = [5, 2, 8, 1, 9]
// Find max and min
let max = Math.max(...numbers) // 9
let min = Math.min(...numbers) // 1
// Sum all
let sum = numbers.reduce((a, b) => a + b, 0) // 25
// Average
let avg = sum / numbers.length // 5
// Sort ascending
let sorted = [...numbers].sort((a, b) => a - b)
console.log(sorted) // [1, 2, 5, 8, 9]