Function truncate

truncate(str: string, length: number, suffix?: string): string
Truncates a string to a specified length and adds an ellipsis. A must-have for UI-focused utility libraries.
Parameters
- str: string
  The string to truncate.
- length: number
  The maximum length of the truncated string (excluding the suffix).
- suffix: string = "..."
  The string to append to the truncated string (default is "...").
Returns string
The truncated string with the suffix if truncation occurred, otherwise returns the original string.
Example
```
truncate("This is a long string that needs to be shortened.", 20)
// "This is a long str..."
```
- Defined in string.ts:82