gistfile1.js

/// 1
db.open(function (err, client) {
    client.createCollection("docs", function (err, col) {
        client.collection("docs", function (err, col) {
            for (var i = 0; i < 100; i++) {
                col.insert({
                    c: i
                }, function () {});
            }
        });
    });
});

/// 2
Step(

function () {
    db.open(this);
},

function (err, client) {
    client.createCollection("docs", this);
},

function (err, col) {
    for (var i = 0; i < 100; i++) {
        col.insert({
            c: i
        });
    }
});

/// 3

db.open(createCollection)

function createCollection(err, client) {
    client.createCollection('docs', insertData)
}

function insertData(err, col) {
    for (var i = 0; i < 100; i++) {
        col.insert({
            c: i
        }, function () {})
    }
}