I just started learning Typescript and need some help with this example.
const alphabet = {
'a': {lower: 97, upper: 65},
'b': {lower: 98, upper: 66}
}
type Char = 'a' | 'b'
function printSome(char: Char){
console.log(alphabet[char])
}
Instead of manually updating the Char type, I'd like to dynamically update generate types from the alphabet object.
You could use the keyof and typeof operators:
const alphabet = {
'a': {lower: 97, upper: 65},
'b': {lower: 98, upper: 66}
}
type Char = keyof typeof alphabet;
function printSome(char: Char){
console.log(alphabet[char])
}
This basically turns alphabet into a type and then gets the keys of that type.