Objective-C with comments to point out semantic syntax differences with Ruby : Part 1

ICEBrain.h

//
//  ICEBrain.h
//

#import <Foundation/Foundation.h>

@interface ICEBrain : NSObject

@property (nonatomic) NSString *someProperty;

- (NSString *)processMessage:(NSString *)message;
- (void)takeFirstParam:(NSString *)first andSecond:(NSString *)second;

+ (NSString *)think;

@end

ICEBrain.m

//
//  ICEBrain.m
//

#import "ICEBrain.h"

@implementation ICEBrain


// def processMessage(message)
- (NSString *)processMessage:(NSString *)message
{
    return message;
}

// def takeFirstParam:andSecond:(first, second)
- (void)takeFirstParam:(NSString *)first andSecond:(NSString *)second
{
    NSLog(@"First: %@\nSecond: %@", first, second);
}

// def self.think
+ (NSString *)think
{
    return @"I'm thinking...";
}

@end

main.m

//
//  main.m
//

#import <Foundation/Foundation.h>
#import "ICEBrain.h"

int main(int argc, const char * argv[]) {

    @autoreleasepool {
        
        // ICEBrain::think
        [ICEBrain think];
        
        // brain = ICEBrain.new
        ICEBrain *brain = [[ICEBrain alloc] init];
        
        // result = brain.processMessage("Hello World")
        NSString *result = [brain processMessage:@"Hello World"];
        
        // brain.takeFirstParamandSecond("first", "second")
        [brain takeFirstParam:@"first" andSecond:@"second"];
        
        // brain.someProperty = "something" with :attr_accessor
        brain.someProperty = @"This is now set to this string.";
        
        brain.someProperty // without assignment returns "This is now set to this string."
        
        NSLog(@"%@", result);
    }
    return 0;
}