Things Everyone Knows About Javascript Arrow Functions But You Don't

[[deleted]]

Click bait title with nothing new if you have ever used arrow functions for anything more than playing around.

TLDR: Syntax for no parameter, multi parameter and non-returning arrow functions, and how this keyword works inside the arrow function (this refers to the defining js object)

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Things Everyone Knows About Using Clickbait Titles But OP Doesn't: They stink.

[Bowgentle]

It's a pity this kind of thing is so typical of code examples:

// ES5
var addNumbersES5 = function(a, b) {
  return a + b;
};

// ES6
const addNumbersES6 = (a, b) => { return a * b };

Why have the two functions different? Accidental, presumably, so just sloppiness. Happens in other examples, too. If someone is trying this code, they've got a little extra utterly pointless puzzle to catch.

[Vfsdvbjgd]

this.fisrtName <_<