d3: Plot as a cumulative graph

问题

Does d3 have a built in method to plot a data set as a cumulative graph?

For example, if the y values are: [2, 4, 2, 2], I want them to actually be plotted as: [2, 6, 8, 10]. Does d3 have a way to do this or would I have to traverse the data set and do this manually?

回答1:

You can check https://github.com/mbostock/d3/wiki/Arrays for more info but I think you can use the reduce() function here.

i.e:

[0, 2, 4, 2, 2].reduce(function(previousValue, currentValue, currentIndex, array) {
  console.log(previousValue + currentValue);//2,6,8,10
  return previousValue + currentValue;
});

来源：https://stackoverflow.com/questions/36706870/d3-plot-as-a-cumulative-graph