For in Objective-C

Objective-C provides several ways to create loops. Here are some basic types of loops.

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // The most basic type, with a single condition.
        int i = 1;
        while (i <= 3) {
            NSLog(@"%d", i);
            i = i + 1;
        }
        
        // A classic initial/condition/after for loop.
        for (int j = 0; j < 3; j++) {
            NSLog(@"%d", j);
        }
        
        // Objective-C doesn't have a direct equivalent to Go's range over an integer,
        // but we can use a for loop to achieve the same result.
        for (int i = 0; i < 3; i++) {
            NSLog(@"range %d", i);
        }
        
        // A while(true) loop will run repeatedly until you break out of the loop
        // or return from the enclosing function.
        while (true) {
            NSLog(@"loop");
            break;
        }
        
        // You can also continue to the next iteration of the loop.
        for (int n = 0; n < 6; n++) {
            if (n % 2 == 0) {
                continue;
            }
            NSLog(@"%d", n);
        }
    }
    return 0;
}

To run the program, compile it using a command like:

$ clang -framework Foundation for_example.m -o for_example
$ ./for_example
1
2
3
0
1
2
range 0
range 1
range 2
loop
1
3
5

Objective-C uses while, do-while, and for loops. The for loop in Objective-C is similar to the C-style for loop in Go. While Objective-C doesn’t have a direct equivalent to Go’s range for integers, we can achieve similar functionality using standard for loops.

The break and continue statements work similarly in Objective-C as they do in other C-derived languages, allowing you to exit a loop early or skip to the next iteration, respectively.

Note that Objective-C uses NSLog() for console output instead of fmt.Println(). Also, Objective-C requires the use of @autoreleasepool for memory management in command-line programs.

We’ll see other forms of iteration later when we look at collections and other data structures in Objective-C.

Constants in Objective-C

If Else in Objective-C

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For in Objective-C