One Thing at a Time

SRP says

One class has one reason to change

Clean Code says

One function processes one task

Observation that Apps on iOS

One app intents to provide one functionality. FB/FB Messager/Yahoo Weahter/Google Map/Google Doc/Google spreadsheets/Dropbox/Dropbox's Photo manager - Carousel/Amazon Shopping/Amazon Kindle/

Why exception is made for.

Normal flow logic handle normal case, let catch handle exception error case

Exceptional C++ says

For exceptional-safe. Process the data first, then use non-throw swap to exchange result and data member. Make the function to be a transaction.

UnitTest Books say

One test should test one thing.


One url/page handle one kind of request(get/list/new/edit)


One change one commit.


One new feature one branch

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