Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function passgen(len, alphabet) {
                var result = '';
    
                if (!alphabet) alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
                var alphabetLength = alphabet.length;
    
                if ((len === undefined) || isNaN(len)) len = 64;
                for (var i = 0; i < len; i++) {
                        var rnd = Math.floor(Math.random() * alphabetLength);
                        result += alphabet[rnd];
                }
    
                return result;
        }
    
    function randomPass() {
        var chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'.split('');
        var password = [];
        var passwordLength = 16;
        while (passwordLength--) { password.push( chars[ Math.round( Math.random() * chars.length ) ] ); }
    
        return password.join('');
      };
  };
</script>

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passgen(16)

randomPass()

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