Strings

Capitalize

Upper-cases the first character and leaves the rest alone.

What it is

The building block for every getter-name and event-name type you will write. Combined with a template literal it turns `name` into `getName`, which is the single most common reason people reach for template literal types at all.

Examples

```
Capitalize<'hello world'>
```
→"Hello world"
```
`get${Capitalize<'name'>}`
```
→"getName"
The getter idiom, in one line. This is what `Capitalize` is for.
```
Capitalize<''>
```
→""

Each resolved type above was printed by TypeScript 5.9.3, not written by hand.

What it does not do

It does not touch anything after the first character. `Capitalize<"hello world">` capitalises one letter, not each word.
It does not know what a word is. Title casing needs you to split on spaces yourself first.

Takeaway

`${Prefix}${Capitalize<K & string>}` is the shape behind every generated method name. The `& string` is there because a key can be a symbol.