endsWith/endsWith.ts

/**
 * @function endsWith
 * @description Checks if a string ends with the provided substring
 * @param {String} str
 * @param {String} substring
 * @param {Number} [pos=0] Position to start checking. Defaults to 0
 * @return {Boolean} True / False
 * @example
 * endsWith('test', 'st')
 * // true
 * @example
 * str('test').endsWith('st')
 * // true
 */

const endsWith = (str: string, sub: string, pos?: number) => {
  str = String(str)

  if (!pos || !isFinite(pos) || Math.floor(pos) !== pos || pos > str.length) {
    pos = str.length
  }

  pos -= sub.length

  const index = str.indexOf(sub, (pos - 1))

  return index !== -1 && index === pos
}

export default endsWith