reusable pattern
// setup
var instance = myChart();
// set/update data
instance.data([0, 5, 10, 15, 20]);
// render
var g = d3.select("g");
instance(g);
function myChart() {
var data;
function chart(g) {
console.log(data);
//enter
//exit
//update
}
chart.data = function(_) {
if(!arguments.length) return data;
data = _;
}
return chart;
}
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