It turns out you can't replace all JavaScript functions with arrow functions because they do completely different things with `this` >_<
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var a = { setX: (x) => { this._x = x; } }; a.setX(67); console.log(a._x); // undefined console.log(window._x); // 67
Of course if you're using both a setter and a getter it can take you quite a while to work out what's going on here -_-
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I call this "syntactic broken glass"
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In summary, JavaScript has two syntaxes for functions. One does what you'd expect, and the other does the opposite
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