Why doesn't this arrow function work in IE 11?

Why doesn't this arrow function work in IE 11?

Below piece of code does not work in IE 11, it throws a syntax error in the console

g.selectAll(".mainBars")
    .append("text")
    .attr("x", d => (d.part == "primary" ? -40 : 40))
    .attr("y", d => +6)
    .text(d => d.key)
    .attr("text-anchor", d => (d.part == "primary" ? "end" : "start"));

Using d3.js bipartite chart for visualization

This code causing the issue in above statement d=>(d.part=="primary"? -40: 40)

回答1

You're using arrow functions. IE11 doesn't support them. Use function functions instead.

Here's Babel's translation of that to ES5:

g.selectAll(".mainBars").append("text").attr("x", function (d) {
  return d.part == "primary" ? -40 : 40;
}).attr("y", function (d) {
  return +6;
}).text(function (d) {
  return d.key;
}).attr("text-anchor", function (d) {
  return d.part == "primary" ? "end" : "start";
});