silly-password-limit-combo-counts.js

(()=>{
const l = 26 // lower
const u = 26 // upper
const d = 10 // digits
const length = 8 // size
const possible = (l + u + d)**length
const invalid =
  (l + d)**length // missing upper
+ (u + d)**length // missing lower
+ (u + l)**length // missing digit
+ (l)**length // missing digit and upper
+ (u)**length // missing digit and lower
+ (d)**length // missing upper and lower
const valid = possible - invalid
const f = (new Intl.NumberFormat).format
console.table({
'Possible':	f(possible),
'Invalid': f(invalid),
'Valid': f(valid),
'Valid / possible':	valid / possible,
'Invalid = possible %': (invalid / possible) * 100 + '%'
})
			 

// https://x.com/BrettLudwig/status/1829071105031852220


})()