bignum vs bn.js

bignums.js

var anvil = require('anvil'),
    bignum = require('bignum'),
    bn = require('bn.js');

anvil('Bignum functions', function (forge, hammer) {
    var bigBuffer, bigString;

    bigBuffer = new Buffer([ 24, 7, 144, 87, 61, 194, 2, 7 ]);
    bigString = '1731511286119924231';

    forge.after(function (error, results) {
        results.forEach(function (report) {
            console.log('%s: %d operations/second.', report.name, report.ops);
        });
    });

    forge.add('bignum to buffer', function () {
        bignum(bigString).toBuffer();
    });

    forge.add('bn to array', function () {
        new bn(bigString).toArray();
    });

    forge.add('bignum from buffer', function () {
        bignum.fromBuffer(bigBuffer);
    });

    forge.add('bn from buffer', function () {
        new bn(bigBuffer);
    });

    forge.add('bignum from buffer toString', function () {
        bignum.fromBuffer(bigBuffer).toString();
    });

    forge.add('bn from buffer toString', function () {
        new bn(bigBuffer).toString();
    });

    hammer();
});

results.md

bignum to buffer: 33910 operations/second.
bn to array: 40950 operations/second.
bignum from buffer: 128041 operations/second.
bn from buffer: 1000000 operations/second.
bignum from buffer toString: 90334 operations/second.
bn from buffer toString: 12151 operations/second.