Optimized Code

Question 1

Memoization

Answer 1

A way to cache a return value of a function based on its parameters. If the parameter changes, it will still have to reevaluate the function.

Question 2

Inline Caching & Hidden Classes

Answer 2

https://richardartoul.github.io/jekyll/update/2015/04/26/hidden-classes.html

Question 3

Managing Arguments

Answer 3

Safe Ways to Use Arguments
• arguments.length
• arguments[i] when i is a valid integer
• NEVER use arguments directly without .length or [i] • STRICTLY fn.apply(y, arguments) is ok

Question 4

Things to be avoided

Answer 4

• eval()
• arguments
• for in
• with
• delete