/**
 * Replaces all Chars in a String
 * @param str base string
 * @param value the value which should be replaced
 * @param replacement the value which is used as replacement
 */
export function replaceAll(str: string, value: string, replacement: string): string {
  return str.split(value).join(replacement);
}

/**
* Function to Pad a String.
* @param num 
* @param size 
* @param maxLength 
*/
export function padString(num: number, size: number, maxLength = false) {

  let _size = size;
  if (typeof maxLength === 'boolean' && maxLength) {
    _size = Math.ceil(Math.log10(size));
  }

  let s = num + "";
  while (s.length < _size) s = "0" + s;
  return s;
}

/**
* Inserts a String in the String
* @param str base string
* @param index index where the content should be inserted
* @param content the content to insert
*/
export function insert(str: string, index: number, content: string): string {
  if (index > 0) {
    return str.substring(0, index) + content + str.substring(index, str.length);
  } else {
    return content + str;
  }
}

/**
 * Function to Camelize a String
 * @param str The String,
 * @param char A, used to determine "new words"
 */
export function camelize(str: string, char = '_') {
  return replaceAll(str, char, ' ').replace(/(?:^\w|[A-Z]|\b\w)/g, function (word, index) {
    return index == 0 ? word.toLowerCase() : word.toUpperCase();
  }).replace(/\s+/g, '');
}