underscore profiling for _.sample and _.shuffle

profile.js

var _ = require('./underscore');
var N = 1000000;
var i;
var input = _.range(1000);
console.log("input = _.range(1000);");

var start = Date.now();
for (i=0; i<N; i++) {
    _.shuffle(input);
}
console.log("%dx _.shuffle(input): %dms", N, (Date.now() - start));

var start = Date.now();
for (i=0; i<N; i++) {
    _.sample(input, 1000);
}
console.log("%dx _.sample(input, 1000): %dms", N, (Date.now() - start));

var start = Date.now();
for (i=0; i<N; i++) {
    _.sample(input, 500);
}
console.log("%dx _.sample(input, 500): %dms", N, (Date.now() - start));

var start = Date.now();
for (i=0; i<N; i++) {
    _.sample(input, 2);
}
console.log("%dx _.sample(input, 2): %dms", N, (Date.now() - start));