Short IF ELSE syntax in objective C

objective-c ios syntax if-statement

40,333

Solution 1

Yes.

Example (pseudo):

value = (expression) ? (if true) : (if false);

Based on your example (valid code):

BOOL result = value ? YES : NO;

Solution 2

It's exactly the same in both languages, except you typically don't find $ signs in Objective-C variable names.

if(value)
return 1;
else
return 0;

return value?1:0;

You should also keep in mind that the conditional operator ?: isn't a shorthand for an if-else statement so much as a shorthand for a true vs false expression. See the PHP manual.

Solution 3

Surprised that nobody has suggested the following :

Long version :

if(value)
    return 1;
else
    return 0;

Small version :
```
return value;
```

And if value isn't a bool variable, just cast it : return (BOOL)value;

40,333

Author by

Firdous

Updated on September 01, 2020

Comments

Firdous over 3 years
Is there any short syntax for if-else statement in objective C like PHP:
```
if($value)
return 1;
else
return 0;
```
shorter version:
```
return $value?1:0;
```
- Bryan Chen over 10 years
  
  return value?1:0; is same as return !!value;
- Hot Licks over 10 years
  
  No, there is no such thing in Objective-C itself. But Objective-C is built on C and has full access to C syntax/semantics, and the exact same syntax is present in C, C++, Java, and several other languages. PHP no doubt got the construct from C.
- Regexident over 9 years
  
  FYI, the ? :-thing is called a ternary operator.
- holex over 9 years
  
  as long as the PHP is based on syntax of ANSI-C-language, and the ObjectiveC is a subset of the ANSI-C-language, and the ternary operator is available in ANSI-C already – this question is totally stupid and would not have deserved even a single upvote.
- Firdous over 9 years
  
  @holex demand my friend!
- holex over 9 years
  
  @Firdous, that 'demand' is based on that fact, where most of the developers have no idea about the languages / operating systems and they are not interested in learning more about those either – and that is really good in my view, because as long as such question can be raised and upvoted 19 times(!) by a strict developer community, none of the companies will question the professionals' rates; they simply demand them and such questions just push our hourly rate up to the sky; it is brilliant, isn't it? :)
- Firdous over 9 years
  
  @holex so how many hourly rate u managed to get after this question? :)
- holex over 9 years
  
  @Firdous, here I'm doing it for fun and free; contact me in private if you have a particular task to commit it and I will tell my rate to you. ;)
atomkirk about 10 years

?: is available in C and kids. It means "this or that if this is false". int i = j ?: k; If j is 0, k will be assigned.
BoltClock about 10 years

@atomkirk: Interesting, so it does exist outside of PHP (and works identically). I removed my erroneous statement.
Regexident over 9 years

That's because the latter (small version) is just wrong. For old ObjC runtimes and compilers at least. On those BOOL is a typedef on signed char. As such any value with a value larger than 255 with the smaller byte all zeros (such as 256) would result in NO, instead of YES, as casting to a single-byte signed char would strip the higher, non-zero bits away. Do return !!value; instead, or return value != NO;. More: nshipster.com/bool
siburb over 9 years

The other benefit of ?: is that "value" is only evaluated once if for example you want to do something like: "if value return value else return nil"
Sergey Lost almost 9 years

This makes my code so nice, tidy and sophisticated. Thanks!
Septronic about 8 years

I used it like this and worked perfectly: NSString *toRet = [dataToSave writeToFile:filePath atomically:NO]? @"Yes" : @"No";