I am working with a type that is a combination of strings:
type MatchType =
| "first"
| "second"
| "third"
My goal is to create a map that uses this type as an index and returns a corresponding number:
let numValue = 3
let myMap: NumberMap = {
"first": numValue,
"second": numValue,
"third": numValue
}
What is the proper way to declare this NumberMap so I can implement the following function:
function getNumber(key: MatchType): number {
return myMap[key]
}
Utilizing a mapped object type and some generics:
type MatchType =
| "red"
| "blue"
| "green"
type MatchingMap = {
[k in MatchType]: number
}
const values: MatchingMap = {
red: 5,
blue: 7,
green: 9,
}
function getMatch<K extends MatchType>(key: K): MatchingMap[K] {
return values[key];
}
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