Why Arrow Functions Cause Syntax Errors in IE 11

In the provided D3.js code, the error arises from the use of arrow functions. IE 11 does not support arrow functions, leading to a syntax error.

Resolution

To address this issue, replace arrow functions with traditional function syntax. The problematic code should be rewritten as:

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";
    });

This uses traditional function syntax to define the same logic as the original arrow functions. IE 11 will now recognize and execute the code correctly.