Skip to content

Instantly share code, notes, and snippets.

@boast

boast/LICENSE.txt

Forked from 140bytes/LICENSE.txt
Created February 2, 2012 14:01
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save boast/1723596 to your computer and use it in GitHub Desktop.
Save boast/1723596 to your computer and use it in GitHub Desktop.
Download ZIP
Recursive Fibonacci with Caching
Raw
README.md
Raw
annotated.js
function f(n){
return f[n] = // Assign and return the cached n-th fibonacci number. Were using the function itself to cache the numbers - cool uh?
2>n ? // If we're looking for 0 or 1 ...
n : // ... just return it, else ...
f[n] || // ... look if we allready have the number in the cache or ...
f(n-1) + f(n-2) // ... calculate it recursively.
}
Raw
index.js
function f(n){return f[n]=2>n?n:f[n]||f(n-1)+f(n-2)}
Raw
LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
Raw
package.json
{
"name": "fibonacciWithCache",
"description": "Recursive Fibonacci number calculation with caching.",
"keywords": [
"number",
"cache",
"recursive",
]
}
Raw
test.html
<!DOCTYPE html>
<title>Fibonacci Test</title>
<div>Expected value: <b>190392490709135</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
var myFunction = function f(n){return f[n]=2>n?n:f[n]||f(n-1)+f(n-2)}
document.getElementById("ret").innerHTML = myFunction(70)
</script>
@tsaniel
Copy link

tsaniel commented Feb 3, 2012

There is no need to use closure.
So just function f(n){return f[n]=2>n?n:f[n]||f(n-1)+f(n-2)} is ok.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment