js_problem

answser1.js

const array1 = [1, 2, 3, 4, 5, 6]
const array2 = array1.flatMap((x) => new Array(x % 2 == 0 ? 2 : 3).fill(null).map(() => x))
console.log(array2)

answser2.js

const array1 = [1, 2, 3, 4, 5, 6]
const array2 = array1.map((x) => x % 2 == 0 ? [x, x] : [x, x, x])
console.log(array2)