Function countChars

countChars(str: string, char?: string): number
Counts characters in a string.
Parameters
- str: string
  The input string.
- Optionalchar: string
  Optional character to count.
Returns number
Number of characters or character occurrences.
Remarks
- If char is provided, only that character’s occurrences are counted.
- If char is omitted, counts total characters in the string.
- All characters are included in the count:
  
  spaces
  
  tabs (\t)
  
  newlines (\n)
  
  unicode characters (emoji, symbols, etc.)
- Internally uses splitString.
Example
```
countChars("banana");       // 6
countChars("banana", "a");  // 3
countChars("banana", "n");  // 2
```
- Defined in packages/@js-utils-kit/string/src/countChars.ts:23