Fake chaining practice - js

chainable

    var d3 = function(){
        var self = this;
        this.foo = function() {
            return this;
        };
        this.range = function(max) {
            var x = [];
            for(var i = 0 ; i < max; i++) {
                x.push(i);
            }
            self.current_arr = x;
            return this;
        };
        this.doubleRange = function(range) {
            if(!range) range = self.current_arr;
            for(var i = 0, len = range.length; i < len; i++ ) {
                range[i] = range[i] * 2;
            };
            self.current_arr = range;
            return this;
        };
        this.nestWithEmpty = function(range) {
            if(!range) range = self.current_arr;
            for(var i = 0, len = range.length; i < len; i++ ) {
                range[i] = [0, range[i]];
            };
            self.current_arr = range;
            return this;
        };
    };

    function init() {
        var x = new d3();
        var res = x.foo()
        .range(100)
        .doubleRange()
        .nestWithEmpty();

        console.log(res.current_arr);
   }

This is a bit jankety, but interesting nonetheless.