Datavis pipeline

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<style>
    .axis .domain,
    .axis line {
        stroke: black;
        fill: none;
        stroke-width: 1;
    }
    .axis text {
        fill: black;
    }
    .panel {
        fill: white;
    }
    svg {
        border: 1px solid silver;
    }
    .line {
        stroke: skyblue;
    }
</style>
</head>
<body>

// Utilities
    //////////////////////////////////////////
    var piper = {};

piper.utils = {
        pipeline: function(){
            var fns = arguments;
            var that = this;
            return function(config) {
                for (var i = 0; i < fns.length; i++) {
                    console.log(i, 'before', config);
                    var cache = fns[i].call(this, config);
                    config = that.mergeAll(config, cache);
                    console.log(i, 'after', config);
                }
            };
        },
        override: function(_objA, _objB){ for(var x in _objB){ if(x in _objA){ _objA[x] = _objB[x]; } } },
        merge: function(obj1, obj2) {
            for (var p in obj2) {
                if (obj2[p] && obj2[p].constructor == Object ) {
                    if (obj1[p]) {
                        this.merge(obj1[p], obj2[p]);
                        continue;
                    }
                }
                obj1[p] = obj2[p];
            }
        },
        mergeAll: function(){
            var newObj = {};
            var objs = arguments;
            for(var i = 0; i < objs.length; i++){
                this.merge(newObj, objs[i]);
            }
            return newObj;
        }
    };

// Modules
    //////////////////////////////////////////

var data = function(_config){
        var config = {
            data: null
        };
        piper.utils.override(config, _config);

var dataConverted = config.data.map(function(d, i){ return {x: i,  y: d}; });

return {
            dataConverted: dataConverted
        };
    };

var scaleX = function(_config){
        var config = {
            dataConverted: null,
            margin: null,
            width: null
        };
        piper.utils.override(config, _config);

var chartWidth = config.width - config.margin.left - config.margin.right;
        var dataX = config.dataConverted.map(function(d){ return d.x; });
        var scaleX = d3.scale.linear()
            .domain(d3.extent(dataX))
            .range([0, chartWidth]);

return {
            scaleX: scaleX
        };
    };

var scaleY = function(_config){
        var config = {
            dataConverted: null,
            margin: null,
            height: null
        };
        piper.utils.override(config, _config);

var chartHeight = config.height - config.margin.top - config.margin.bottom;
        var dataY = config.dataConverted.map(function(d){ return d.y; });
        var scaleY = d3.scale.linear()
            .domain(d3.extent(dataY))
            .range([0, chartHeight]);

return {
            scaleY: scaleY
        };
    };

var axisX = function(_config){
        var config = {
            scaleX: null
        };
        piper.utils.override(config, _config);

var axisX = d3.svg.axis().scale(config.scaleX)
            .orient('bottom')
            .ticks(10);

return {
            axisX: axisX
        };
    };

var axisY = function(_config){
        var config = {
            scaleY: null
        };
        piper.utils.override(config, _config);

var axisY = d3.svg.axis().scale(config.scaleY)
            .orient('left')
            .ticks(6);

return {
            axisY: axisY
        };
    };

var panelComponent = function(_config){
        var config = {
            container: null,
            width: null,
            height: null,
            margin: null
        };
        piper.utils.override(config, _config);

var root = d3.select(config.container)
            .append('svg')
            .attr({
                'class': 'chart',
                width: config.width,
                height: config.height
            });

var panel = root.append('g')
            .attr({
                'class': 'panel',
                transform: 'translate(' + config.margin.left + ',' + config.margin.top + ')'
            });

return {
            root: root,
            panel: panel
        };
    };

var axisComponentX = function(_config){
        var config = {
            axisX: null,
            height: null,
            panel: null,
            margin: null
        };
        piper.utils.override(config, _config);

config.panel.append('g')
            .attr({
                'class': 'x axis',
                transform: 'translate(' + [0, config.height - config.margin.top - config.margin.bottom] + ')'
            })
            .call(config.axisX);

return {};
    };

var axisComponentY = function(_config){
        var config = {
            axisY: null,
            panel: null
        };
        piper.utils.override(config, _config);

config.panel.append('g')
            .attr({'class': 'y axis'})
            .call(config.axisY);

return {};
    };

var shapes = function(_config){
        var config = {
            panel: null,
            dataConverted: null,
            scaleX: null,
            scaleY: null
        };
        piper.utils.override(config, _config);

var line = d3.svg.line()
            .x(function(d){ return config.scaleX(d.x); })
            .y(function(d){ return config.scaleY(d.y); });

config.panel.datum(config.dataConverted)
            .append('path')
            .attr({
                'class': 'line',
                d: line
            });

return {};
    };

// Pipeline
    //////////////////////////////////////////

var lineChart = piper.utils.pipeline(
        data,
        scaleX,
        scaleY,
        axisX,
        axisY,
        panelComponent,
        axisComponentX,
        axisComponentY,
        shapes
    );

// Usage
    //////////////////////////////////////////

var dataset = d3.range(100).map(function(d, i){ return Math.random()*100; });

var config = {
        container: document.querySelector('.chart-container'),
        data: dataset,
        width: 400,
        height: 300,
        margin: {top: 20, right: 20, bottom: 40, left: 40}
    };

lineChart(config);

</script>
</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js