simple but practical js password generator

generate_password.coffee

# npm install lodash
# coffee -bc generate_password.coffee && node ./generate_password.js

`const _ = require('lodash')`

charList = "abcdefghijklmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ123456789"    # omit o,O,0
symbolList = "._-=[]{}+#^!?"

symbolListEscaped = _.reduce symbolList.split(''), ((r, s) -> r += "\\#{s}"), ''

generatePassword = (len) ->
  pickOne = (n) ->
    # normal chars on first and last ones
    list = if n == 0 or n == len - 1 then charList else charList + symbolList
    list[Math.floor(Math.random() * list.length)]

  countSymbol = (str) ->
    (str.match(new RegExp(///[#{symbolListEscaped}]///, 'g')) || []).length

  check = (str) ->
    # omit successive chars
    return false if str.match /(.)\1\1/

    # confirm the str contains 1..2 symbols
    return false if countSymbol(str) == 0
    return false if countSymbol(str) > 2

    true

  while 1
    result = _.reduce [0..len - 1], ((r, n) -> r += pickOne(n)), ''
    return result if check result

for [0..20]
  console.log generatePassword 16