Discussion on: 5 Ways to Write Functions in JavaScript

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There is also Function constructor:

var sum = new Function('a,b', 'return a + b');

Note that Functions are instances of Function.

(function() {}) instanceof Function;

Great Jakub.

I wanted to add this one in the article, but it's not really widely used.

You're right, but to be complete you need to know about it.

Also, you missed named function expressions:

const mul = function recur(a, b){
    if (a === 0) {
       return b;
    }
    return recur(a -1, b + 1);
};

and immedietly invoked function expressions:

(function() {
   const x = 10;
   console.log({x});
})();