code

if

BOOL b = NO;if (a == YES){ b = YES;}else{ b = NO;}

BOOL b = a ? YES: NO;

BOOL b = a;

BOOL b = NO;if (a == YES){ b = YES;}else{ b = NO;}

BOOL b = NO;if (a = YES){ b = YES;}else{ b = NO;}

if

if if

if else…

if …

goto fail;

MVC

code if else model

Unit Test