using memoize function with underscore.js

Question

I am trying to cache the result from an ajax call using memoize function from Underscore.js. I am not sure of my implementation. Also how to retrieve b

Answer 1

_.memoize takes a function:

var fibonacci = _.memoize(function(n) {
  return n < 2 ? n: fibonacci(n - 1) + fibonacci(n - 2);
});

You should understand that this is just an extra wrapper function that makes function that you pass it as an argument smarter( Adds extra mapping object to it ).

In example above function that computes fibonacci number is wrapped around with _.memoize. So on every function call (fibonacci(5) or fibonacci(55555)) passed argument matched to return value so if you need to call one more time fibonacci(55555) it doesn't need to compute it again. It just fetches that value from that mapping object that _.memoize provided internally.