Memoization
Once an expensive function runs, it can rewrite itself with an optimized version.
Memoization is a technique similar to caching that takes advantage of
the fact that functions are just data.
var getElement = function() {
console.log("creating element");
var element = document.createElement("div");
// ... Do a bunch of expensive operations
// Now OVERWRITE this function with a SIMPLER VERSION
getElement = function() {
return element;
};
return element;
};
The first time getElement runs, it creates the element and runs a bunch
of code with it. Then it rewrites the getElement function to solely return the created element. This makes subsequent calls to getElement much quicker.
