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
Go 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
func regionTax(regionRates map[string]int, region string) int {
}Worked examples
| Call | Result |
|---|---|
regionTax(map[string]int{"US": 700, "EU": 1900, "TR": 1800}, "EU") | 1900 |
regionTax(map[string]int{"US": 700}, "UK") | 0 |
regionTax(map[string]int{}, "US") | 0 |
regionTax(map[string]int{"DE": 1900, "FR": 2000}, "DE") | 1900 |
Hint
Map lookup with a default.
Reference solution in Go
func regionTax(regionRates map[string]int, region string) int {
if r, ok := regionRates[region]; ok {
return r
}
return 0
}