Function countOccurrence

countOccurrence(str: string, char: string): number
Counts how many times a character appears in a string.
Parameters
- str: string
  The string to search.
- char: string
  The character to count.
Returns number
The number of occurrences.
Example
```
countOccurrence('hello world', 'l'); // 3
```
- Defined in string/countOccurrences.ts:11