Discussion on: Daily Challenge #248 - Chinese Numerals

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I didn't quite get what the deal was with the zero, and since there were no examples to show how it worked, I decided to do Japanese numerals, which are basically the same but without the zero. Here's my JavaScript implementation. It could probably be a lot simpler, but oh well.

const numerals = {
    0: '0',
    1: '一',
    2: '二',
    3: '三',
    4: '四',
    5: '五',
    6: '六',
    7: '七',
    8: '八',
    9: '九',
}

const units = {
    0: '',
    1: '十',
    2: '百',
    3: '千',
    4: '万',
}

const toJapaneseNumeral = n => n
    .toString()
    .split('')
    .reverse()
    .map((x, i) => numerals[x] + units[i])
    .reverse()
    .join('')
    .replace('一十', '十')
    .replace(/0.?/g, '')