Iterator interface

[superbobry]

Have you considered complementing parse and parseRows with iterator-based versions? This might be useful e.g. if one only needs to sumarise the data.

[mbostock]

You can achieve similar functionality by passing a row conversion function that returns null or undefined. For example using d3.csvParse:

var sum = 0;
d3.csvParse(csv, function(d) {
  sum += +d.foo;
});
console.log("sum", sum);

Or using d3.csv:

var sum = 0;
d3.csv("numbers.csv", function(d) {
  sum += +d.foo;
}, function(error) {
  if (error) throw error;
  console.log("sum", sum);
});

A proper iterator might be nice, but I don’t feel like it’s urgent to provide an alternative API at this point. Although it might be nice when we can require that native ES collections/iterables and for…of loops are available.

[superbobry]

I see, thank you very much.