eero Demo

demo.eero

#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>

interface FileHelper : Object  // "Object" is the same as "NSObject"

  property (readonly)
    String volumeName    // both are readonly properties
    String volumeFormat  //

  + pathStringWithComponents: Array, return String  // class method

  openFile: String, [withPermissions: String], return FileHandle  // instance method

end

implementation FileHelper  // no '@' needed for objc keywords

  private  // no "{}" needed for instance variables
    int iBytesUsed
    int iBytesFree

  // "components" is the default arg variable name for "pathStringWithComponents"
  + pathStringWithComponents: Array, return String
    fullPathName := ''  // empty objc string literal implies mutable
    for String component in components
      fullPathName << '/' + component  // string concatenation with '+' and '<<'
    return fullPathName

  // "withPermissions" was declared optional, so default value is defined here
  openFile: String path, withPermissions: String = 'readonly', return FileHandle
    FileHandle handle = nil
    if permissions == 'readonly' or permissions == 'r'
      handle = FileHandle fileHandleForReadingAtPath: path
    else if permissions == 'readwrite' or permissions == 'rw'
      handle = FileHandle fileHandleForUpdatingAtPath: path
    return handle

end

int main() 
  autoreleasepool
  
    helper := FileHelper new  // declare variable "helper" via type inference

    files := []  // empty array literal implies mutable
    files addObject: (helper openFile: 'readme.txt')  // can group message in parens

    for FileHandle handle in files  // all objects are pointers, so no '*' needed
      Log( 'File descriptor is %@', (Number)(handle fileDescriptor) )
      handle closeFile

  return 0  // semicolons are optional almost everywhere

demo.fmt.eero

#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>

interface ROFileHelper : NSObject  // prefixes make for easily-identifiable code

  property (readonly)
    NSString volumeName    // both are readonly properties
    NSString volumeFormat  //

  + pathStringWithComponents: NSArray, return NSString  // class method

  - openFile: NSString, [withPermissions: NSString], return NSFileHandle  // instance method, long live the "-" prefix!

end

implementation ROFileHelper  // no '@' needed for objc keywords

  private  // no "{}" needed for instance variables
    int iBytesUsed
    int iBytesFree

  // "components" is the default arg variable name for "pathStringWithComponents". but we're all about verbosity, right?
  + pathStringWithComponents: NSArray components, return NSString
    fullPathName := ''  // empty objc string literal implies mutable
    for NSString component in components
      fullPathName << '/' + component  // string concatenation with '+' and '<<'
    return fullPathName

  // "withPermissions" was declared optional, so default value is defined here
  - openFile: NSString path, withPermissions: NSString = 'readonly', return NSFileHandle
    NSFileHandle handle = nil
    if permissions == 'readonly' or permissions == 'r'
      handle = (NSFileHandle fileHandleForReadingAtPath: path) // parens around calls make it a little easier to see the call.
    else if permissions == 'readwrite' or permissions == 'rw'
      handle = (NSFileHandle fileHandleForUpdatingAtPath: path)
    return handle

end

int main() 
  autoreleasepool
  
    helper := ROFileHelper new  // declare variable "helper" via type inference

    files := []  // empty array literal implies mutable
    (files addObject: (helper openFile: 'readme.txt'))  // can group message in parens

    for NSFileHandle handle in files  // all objects are pointers, so no '*' needed
      fileDescriptorNumber := (NSNumber) (handle fileDescriptor) // if we don't split these two lines up
      NSLog( 'File descriptor is %@', fileDescriptorNumber ) //we could end up with parens for a function call, a cast, and a method call *shudder*
      handle closeFile

  return 0  // semicolons are optional almost everywhere