意外转译 ES6>ES5

Question

When transpiling this function into ES5 from ES6 (using Babel) I didn't expect it to change

var func = function(msg){
  alert(msg);
}

but it became

var func = function func(msg) {
        alert(msg);
};

Why is this and how does it affect usage of the function, if at all? Even if it doesn't affect usage, is there anything I should know? Thank you.

Answer 1

It doesn't affect the usage of the function as well, but it does give the function a way to reference itself.

In the following snippet, notice that I recursively call ff -- which is local only to that function, while I invoke it using func .

The upshot is: It's harmless, and you can ignore it.

 var func = function ff(t) { if (t === 0) { console.log("Countdown down"); } else { console.log("Counting down", t); ff(t - 1); } }; func(10);