Look up the tax rate for a region
A billing system stores tax rates by region code. Look up the rate; an unknown region is not taxed.
- Rates are stored as integer percentages in minor units.
- A region not present in the map returns 0.
regionTax(regionRates: map<string, int>, region: string) → int
Java needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
int regionTax(Map<String, Integer> regionRates, String region) {
}Worked examples
| Call | Result |
|---|---|
regionTax(Main.<String, Integer>mp("US", 700, "EU", 1900, "TR", 1800), "EU") | 1900 |
regionTax(Main.<String, Integer>mp("US", 700), "UK") | 0 |
regionTax(Main.<String, Integer>mp(), "US") | 0 |
regionTax(Main.<String, Integer>mp("DE", 1900, "FR", 2000), "DE") | 1900 |
Hint
Map lookup with a default.
Reference solution in Java
int regionTax(Map<String, Integer> regionRates, String region) {
Integer r = regionRates.get(region);
return r == null ? 0 : r;
}