Function resolveSelector

resolveSelector<T, R>(
    selector?: keyof T | ((item: T) => R),
    fallback?: (item: T, index?: number) => R,
    name?: string,
): (item: T, index?: number) => R
Resolves a selector parameter into a function that extracts a value from an item.

The selector can be:
- a key string of the object (returns the value at that key),
- a function transforming the item to the desired value,
- or undefined, in which case a fallback function must be provided.
Type Parameters
- T
  The type of the input items.
- R
  The type of the selected value.
Parameters
- Optionalselector: keyof T | ((item: T) => R)
  The selector key or function.
- Optionalfallback: (item: T, index?: number) => R
  A fallback function if no selector is provided.
- Optionalname: string = 'selector'
  Name used in error messages.
Returns (item: T, index?: number) => R
The resolved selector function.
Example
```
const sel1 = resolveSelector<{name: string}, string>('name');
sel1({name: 'Alice'}); // 'Alice'

const sel2 = resolveSelector<{value: number}, number>(item => item.value * 2);
sel2({value: 5}); // 10

const sel3 = resolveSelector(undefined, (item) => item.toString());
sel3(42); // '42'
```
Throws
If the selector is not a function or string key.

Throws
If no selector is provided and no fallback is given.
- Defined in src/utils/core.utils.ts:95