es-toolkit/docs/reference/array/takeWhile.md
Minsoo Kim cf65b2c601
style(*): Setup prettier and apply formatting (#24)
* chore: add prettierrc

* chore: apply format with prettier config

* chore: eslint error fix
2024-06-04 17:19:26 +09:00

31 lines
837 B
Markdown

# takeWhile
Returns a new array containing the leading elements of the provided array
that satisfy the provided predicate function. It stops taking elements as soon
as an element does not satisfy the predicate.
## Signature
```typescript
function takeWhile<T>(arr: T[], shouldContinueTaking: (element: T) => boolean): T[];
```
### Parameters
- `arr` (`T[]`): The array to take elements from.
- `shouldContinueTaking` (`(item: T) => boolean`) The predicate function that is called with each element. Elements are included in the result as long as this function returns true.
### Returns
(`T[]`) A new array containing the elements taken from the beginning while the predicate returns `true`.
## Examples
```typescript
// Returns [1, 2]
takeWhile([1, 2, 3, 4], x => x < 3);
// Returns []
takeWhile([1, 2, 3, 4], x => x > 3);
```