/**
 * 格式化替换字符串
 * @function omitStr
 * @memberof module:string
 * @param { string } str 需要操作的字符串
 * @param { number } start  开始位置
 * @param { number } end  结束位置 3 的话就是倒数第三个 倒数第三个不被替换
 * @param { string } replaceStr  替换的值 默认 '*'
 * @example
 * omitStr('185098535', 2, 3, '*') // 18****535
 */

function omitStr(str, start, end, replaceStr = '*') {
  if (typeof str !== 'string' || !Number.isInteger(start) || !Number.isInteger(end) || typeof replaceStr !== 'string') {
    throw new TypeError('str and replaceStr must be strings; start and end must be integers')
  }
  if (start < 0 || end < 0 || start + end > str.length) throw new RangeError('start and end must identify a range within str')
  const startPosition = start
  const endPosition = end
  const count = str.length - startPosition - endPosition
  return str.slice(0, startPosition) + replaceStr.repeat(count) + str.slice(count + startPosition)
}

export default omitStr