combined cache problem and solution
formated object property caching
added cache image
added cycle image
typo and moved for in forward
added basic for in loop
added has own propety
changed order of text in for lioop
cache hasOwnProperty
added fro in corerce to object
added loop image
added image for loop
added halfScreenImage
added perfromance strategy imag
added backward for loop perfromance
added filter vs if condition
compared for with for-in
basic while loop
added reverse while
added summary of for loop