I would like to generate a random password respecting the following format:
I thought about it and the only thing I could think of is some function that is quite long and ugly. Could you guys offer me a simpler, more efficient way of doing this?
PS: I'm using this function not on the client side, but on the server side, on my Node.js web application.
Here is my solution:
/**
* sets of charachters
*/
var upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
var lower = 'abcdefghijklmnopqrstuvwxyz'
var digit = '0123456789'
var all = upper + lower + digit
/**
* generate random integer not greater than `max`
*/
function rand (max) {
return Math.floor(Math.random() * max)
}
/**
* generate random character of the given `set`
*/
function random (set) {
return set[rand(set.length - 1)]
}
/**
* generate an array with the given `length`
* of characters of the given `set`
*/
function generate (length, set) {
var result = []
while (length--) result.push(random(set))
return result
}
/**
* shuffle an array randomly
*/
function shuffle (arr) {
var result = []
while (arr.length) {
result = result.concat(arr.splice(rand[arr.length - 1]))
}
return result
}
/**
* do the job
*/
function password (length) {
var result = [] // we need to ensure we have some characters
result = result.concat(generate(1, upper)) // 1 upper case
result = result.concat(generate(1, lower)) // 1 lower case
result = result.concat(generate(1, digit)) // 1 digit
result = result.concat(generate(length - 3, all)) // remaining - whatever
return shuffle(result).join('') // shuffle and make a string
}
console.log(password(6))
How about we place the formats into strings and we can place than into an array, then randomly chose one and randomly chose and item in that sub-array item:
var uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var lowers = "abcdefghijklmnopqrstuvwxyz";
var digits = "01234567890";
var all = uppers + lowers + digits;
var choices = [uppers,lowers,digits];
var checks = [];
var password = "";
var ranLength = Math.ceil(Math.random()*10)+3;
for(var i=0; i<ranLength; i++){
var choice = choices[Math.ceil(Math.random()*3)-1];
var choiceItem = choice[Math.ceil(Math.random()*(choice.length))-1]
password += choiceItem;
}
for(var i=0; i<3; i++){ // Append needed values to end
var choice = choices[i];
var choiceItem = choice[Math.ceil(Math.random()*(choice.length))-1]
password += choiceItem;
}
password = password.split('').sort(function(){
return 0.5 - Math.random();
}).join('');
alert(password);
Edited: Sorry made a small mistake. Fixed.
