Why Are My d3.js Arrow Functions Failing in IE11?

Arrow Function Syntax Error in IE 11

Using d3.js for visualization, a piece of code encounters a syntax error when executed in IE 11. The error occurs specifically within the arrow functions used to define attributes.

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"));

The Issue

The culprit of the error is the usage of arrow functions d => {}, which are not supported in IE 11. Arrow functions are a modern JavaScript syntax introduced in ES6, while IE 11 only supports up to ES5.

The Solution

To resolve the issue, replace the arrow functions with traditional function syntax, which is understood by IE 11.

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";
    });

Additional Considerations

While the traditional function syntax is supported in IE 11, it's generally recommended to use modern JavaScript features when feasible, as they offer cleaner and more efficient code. However, for compatibility with older browsers like IE 11, it's necessary to use the ES5 syntax in this case.

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