JSFiddle - React, Tailwind, and code Playground

by pseudosavant

HTML

<pre id="output"></pre>

JavaScript

$("#output").html("loading");

var arr = ["","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","0","1","2","3","4","5","6","7","8","9"],
    len = arr.length,
    i, j, k, l,
    output = [];

for (i=0; i<len; i++) { // 63
    for(j=0; j<len; j++) { // 3969
        for(k=0; k<len; k++) { // 250047
            setTimeout(
                (function() {
                    return function() {
                        for(l=0; l<len; l++) { // 15752961
                            output.push(arr[i]+arr[j]+arr[k]+arr[l]);
                        }
                    }
                })(),
            1);
        }
    }
}

if (!!JSON && !!JSON.stringify) {
    $("#output").html(JSON.stringify(output));
} else {
    $("#output").html(output.toString());
}