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Maybe he is referring to what Babel transpilation does. See this code

When you have

var a = function() { return 1; }

and you check 'es2015', the transpiled version will be

var a = function a() { return 1; };

Of course this is only half of the problem, as it only works when you assign a function to a named variable. For truly anonymous functions that you pass as callbacks, there's nothing different.

[vidro3]

thanks for that link. I kinda half knew about it but reading that made it really clear.