before
The before function returns all elements of an array or characters of a string before the specified index.
Syntax
typescript
before(string: string, index: number): string;
before<T>(array: T[], index: number): T[];Parameters
| Name | Type | Description |
|---|---|---|
array | T[] | string | Source array or string |
index | number | Index before which elements are returned |
Returns
| Type | Description |
|---|---|
T[] | string | Elements or characters before the index |
Examples
typescript
before([1, 2, 3, 4], 2); // => [1, 2]
before("abcdef", 3); // => "abc"Notes
- The index is zero-based.
- Returns an empty array or string if the index is 0.