JSFiddle - React, Tailwind, and code Playground

JavaScript

/*
 * Returns a String with length = 2^n whose characters are 'x'
 */
function getString(n) {
    var str = 'x';
    for (var i = 0; i < n; i++)
    str = str + str;
    return str
}

/*
 * Returns the time of comparing two equals strings with length 2^n using the === operator
 */
function compare(str1, str2) {
    equals = str1 === str2;
    // equals is always true. we assign the result of the comparaton to a variable because if we don't do it, javascript optimizations could skip the execution of the comparation instruction (as it wouldn't have any side effects)
    return equals;
}

function main() {
    // We double the string length every iteration
    for (var n = 1; n <= 27; n++) {        
        var str1 = getString(n);
        var str2 = getString(n);
        var t0 = Date.now();
        var result =  compare(str1,str2);
        var t1 = Date.now() - t0;
        console.log("lengths: "+str1.length+",result: "+result);
        console.log("time elapsted: "+ Math.pow(2, n) + ': ' + t1);
    }
}

main();