How to use d3.min and d3.max within a d3.json command

Question

I\'m new to d3 and Javascript. I have played around with the choropleth example but would like to now make some more detailed changes. One of which is to find the max and mi

Answer 1

I'm new to d3 and JavaScript as well but I found a workaround to find the min and max of three lines with objects, using d3.extent and .concat:

y.domain(
  d3.extent(
    d3.extent(data, function(d) {
      return d.line1;     })
    .concat(d3.extent(data, function(d) {
      return d.line2;     })
            .concat(d3.extent(data, function(d) {
      return d.line3;     })
                   ))
  ));