benchmarking node binary-to-url-encoding

gistfile1.txt

var fs = require('fs');

var re = /(..)/g;
var methods = {
    with_escape:  function(data, cb) {
        cb(escape(data.toString('binary')));
    },
    with_loop: function (data, cb) {
        var buf = '';
        for (var n = 0; n < data.length; n++) {
            buf += '%' + data[n].toString(16);
        }
        cb(buf);
    },
    with_broken_loop: function (data, cb) {
        var buf = '', n = 0;

        var rescheds = 0;
        var do_chunk = function() {
            for (n = n; n < data.length; n++) {
                buf += '%' + data[n].toString(16);

                // Sometimes, break up the work
                if (! (n % 10000)) {
                    rescheds++;
                    process.nextTick(do_chunk);
                    n++; // because for() wont do it with early return
                    return;
                }
            }
            console.log(rescheds + ' rescheds')

            cb(buf);
        };
        do_chunk();
    },
    with_regex: function(data, cb) {
        cb(data.toString('hex').toUpperCase().replace(/(..)/g, "%$1"));
    },
    with_regex_lower: function(data, cb) {
        cb(data.toString('hex').replace(/(..)/g, "%$1"));
    },
    with_precompiled_regex: function(data, cb) {
        cb(data.toString('hex').toUpperCase().replace(re, "%$1"));
    },
    with_no_percents: function(data, cb) {
        cb(data.toString('hex'));
    },
};

fs.readFile('testfile.mp3', function(err, data) {
    console.log('Testing urlification of binary data of ' + data.length + ' bytes')

    var method_names = Object.keys(methods);
    var do_next = function() {
        var method = method_names.shift();
        var before = new Date();
        methods[method](data, function(encoded) {
            var after = new Date();
            var delta = after - before;
            console.log(method + ': ' + (delta / 1000) + ' seconds');

            if (method_names.length) do_next();
        });
    };
    do_next();
});


/* Results:

count@bumba:~$ ./url-my-url.js 
Testing urlification of binary data of 6255970 bytes
with_escape: 0.277 seconds
with_loop: 1.704 seconds
626 rescheds
with_broken_loop: 1.684 seconds
with_regex: 2.66 seconds
with_regex_lower: 2.889 seconds
with_precompiled_regex: 4.506 seconds
with_no_percents: 1.645 seconds

*/