gistfile1.txt

var Immutable  = require("immutable"),
    t          = require("transducers-js"),
    comp       = t.comp,
    map        = t.map,
    filter     = t.filter,
    transduce  = t.transduce;

var inc = function(n) { return n + 1; };
var isEven = function(n) { return n % 2 == 0; };
var sum = function(a,b) { return a+b; };

// faster with transducers
var xf = comp(map(inc),filter(isEven));

var largeVector = Immutable.Vector();
var largeArray = [];

for(var i = 0; i < 10000000; i++) {
    largeVector = largeVector.push(i);
    largeArray.push(i);
}

console.time('Native');
largeArray.map(inc).filter(isEven).reduce(sum);
console.timeEnd('Native');

console.time('Transduce');
transduce(xf, sum, 0, largeArray);
console.timeEnd('Transduce');

console.time('Immutable');
largeVector.map(inc).filter(isEven).reduce(sum);
console.timeEnd('Immutable');

console.time('Immutable + Transduce');
transduce(xf, sum, 0, largeVector);
console.timeEnd('Immutable + Transduce');