minor changes
removed todo
create a copy detail index
removed text from two script
merged number with string
updated hoisting
merge array creation
removed object
merge as little as possible
commented why filter is slow
merged for in initial slide
merged while with for-in
combined cache dom
commented conct query selector all
merge selected by attribute
updated DOM summary
commented inheritance and event object
commented out inheritance
commented addy osmani memoization
commented out jquery