Memoization

Chris Laughlin

Who am I?

JavaScript Developer @Rapid7

Open source contributor   

All round JavaScript nerd

Jack of all trades, master of none

History 

• Coined by Donald Michie in 1968
• Grew in popularity with functional programming (Haskell/Erlang)
• Mentioned in JavaScript: The good parts 

Basics

• Memoize === cache 
• Function wrapping 
• Performance improving 

fibonacci

cache?

Memoize Pattern

Benchmarks

Cons

• Can't be used with non-pure functions
• Functions that get data that has to always be up-to-date 
• Functions with large parameters or functions as params 

Pros

• Reduced execution time
• Encourages functional programming
• MAKES EVERYTHING FAST!

But wait there is more!

Memoize React component?

questions?......