text: const crypto = require('crypto');
  
  function hide () {
    return () => 'hide'
  }
  
  function hash () {
    return value => {
      return crypto.createHash('sha256')
        .update(value)
        .digest('hex')
    }
  }
  
  function slice (start, end) {
    return value => value.slice(start, end)
  }
  
  module.exports = {
    hide,
    hash,
    slice
  }
  