NICE STRING VALIDATOR

validateString.js

const _validators = {
  required: value => !!value.length,
  'min-length': (value, min) => value.length >= +min,
  'max-length': (value, max) => value.length <= +max,
  number: value => isNaN(+value),
  equals: (value, equals) => value === equals,
  regexp: (value, regexp) => new RegExp(regexp).test(value),
}

/**
 * Validate string using validators parameter (validators can consist of 'required', 'min-length', 'max-length', 'number')
 * @param {string} field
 * @param {string[]} validators its array of strings. strings : 'required' 'min-length#{number}' 'max-length#{number}' 'number'
 * @returns {boolean} true/false validation result
 * @example
 * // returns true
 * validateString('example1', ['required','min-length#5']);
 * @example
 * // returns false
 * validateString('example2', ['required','number']);
 */
export const validateString = (field, validators) =>
  validators
    .map(v => {
      const split = v.split('#')
      return _validators[split[0]] && _validators[split[0]](field, split[1])
    })
    .every(v => !!v)

perf tests:
https://jsperf.com/check-string-validation-classic-array-2 (classic array)
https://jsperf.com/check-string-validation/1 (map and every methods)