An easy way to build a custom sequence of callable operations using dot notation.

DotSequence.js

function DotSequence(seq) {
    var self = this;
    seq = seq || [];
    self.commands = {};
    self.addCommand = function (name,operation) {
        self.commands[name] = operation;
        self[name] = function (...params) {
            seq.push({
                command: name,
                params
            });
            return self;
        };
        return self;
    };
    self.addCommand("wait",function(){
        //Hard coded in 'end' function
    });
    self.end = function () {
        function execute(index) {
            if (index < seq.length) {
                var element = seq[index];
                if (element.command == "wait") {
                    setTimeout(function () {
                        execute(index + 1);
                    }, element.params[0]);
                } else {
                    self.commands[element.command](...element.params);
                    execute(index + 1);
                }
            } else {
                console.log("( Sequence Completed )");
            }
        }
        execute(0);
    };
}
/*

// Sequence like so:
var s = new DotSequence()
.addCommand("log", function (message){ // create a command
  console.log(message);
})
.log("Hello world")
.wait(3000)
.log("Hello world... 3 seconds later")
.wait(4000)
.log("Goodbye world")
.end();

// Call single operations like so:
s.log("Hi there");
// Note 'wait' will only work when used in a sequence followed by 'end'
s.wait(1000).log('done waiting').end();
*/