ScriptdrillFormat money
A JavaScript exercise from Scriptdrill. Solve it with a code editor in your browser that runs your function against example and hidden tests, and it is checked the moment you submit.
The task
Format `amount` as money in the given ISO currency code (like `"USD"` or `"JPY"`) and locale, the way `Intl.NumberFormat` does with `style: "currency"`. Each currency keeps its usual number of decimals, and each locale its own grouping.
What this exercise teaches
Intl.NumberFormat knows each currency's minor units (2 for USD, 0 for JPY) and each locale's grouping, such as the Indian lakh grouping 12,34,567. Hand-built formatting gets these wrong.
A hint if you get stuck
Look at `Intl.NumberFormat` with the `style: "currency"` option. It handles the symbol, the sign, grouping and rounding for you.
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