Typo: fuction -> function
Typo: 'execute once' -> 'executed once'
Typo: undedfined -> undefined
Typo: Lets -> Let's
Untested: Fix broken code block due to tabs
Remove extra newline
Typo: 'aid. it's' -> 'aid. It's'
Typo: 'concerns pattern' -> 'concerns a pattern'
Typo: 'binding,and' -> 'binding, and'
Typo: 'like are objects everywhere' -> 'like objects are everywhere'
Untested: code indentation fix
Typo: 'into a function operates' -> 'into a function that operates'
Merge pull request #6 from cjb/master

Typo fixes