challenge.js

// Transforms a string to either upper or lowercase, depending which is dominant
// code => code
// coDe => code
// CoDE => CODE
// etc.
const transform = input => {
    const lower = [...input].reduce((count, char) => {
        return char == char.toLowerCase() ? count + 1 : count
    }, 0)
    return lower / input.length >= .5 ? input.toLowerCase() : input.toUpperCase()
}