Merge branch 'master' of https://github.com/adambard/learnxinyminutes-docs

elixir.html.markdown

@@ -91,6 +91,11 @@ string.
 <<1,2,3>> <> <<4,5>> #=> <<1,2,3,4,5>>
 "hello " <> "world"  #=> "hello world"
 
+# Ranges are represented as `start..end` (both inclusive)
+1..10 #=> 1..10
+lower..upper = 1..10 # Can use pattern matching on ranges as well
+[lower, upper] #=> [1, 10]
+
 ## ---------------------------
 ## -- Operators
 ## ---------------------------

objective-c.html.markdown

@@ -55,7 +55,7 @@ int main (int argc, const char * argv[])
     id       myObject2 = nil;  // Weak typing
     // %@ is an object
     // 'description' is a convention to display the value of the Objects
-    NSLog(@"%@ and %@", myObject1, [myObject2 description]); // Print "(null) and (null)"
+    NSLog(@"%@ and %@", myObject1, [myObject2 description]); // prints => "(null) and (null)"
     
     // String
     NSString *worldString = @"World";
@@ -128,9 +128,10 @@ int main (int argc, const char * argv[])
     // May contain different data types, but must be an Objective-C object
     NSArray *anArray      = @[@1, @2, @3, @4];
     NSNumber *thirdNumber = anArray[2];
-    NSLog(@"Third number = %@", thirdNumber); // Print "Third number = 3"
+    NSLog(@"Third number = %@", thirdNumber); // prints => "Third number = 3"
-    // NSMutableArray is mutable version of NSArray allowing to change items in array
+    // NSMutableArray is a mutable version of NSArray, allowing you to change 
-    // and extend or shrink array object. Convenient, but not as efficient as NSArray
+    // the items in the array and to extend or shrink the array object. 
+    // Convenient, but not as efficient as NSArray.
     NSMutableArray *mutableArray = [NSMutableArray arrayWithCapacity:2];
     [mutableArray addObject:@"Hello"];
     [mutableArray addObject:@"World"];
@@ -140,7 +141,7 @@ int main (int argc, const char * argv[])
     // Dictionary object
     NSDictionary *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" };
     NSObject *valueObject     = aDictionary[@"A Key"];
-    NSLog(@"Object = %@", valueObject); // Print "Object = (null)"
+    NSLog(@"Object = %@", valueObject); // prints => "Object = (null)"
     // NSMutableDictionary also available as a mutable dictionary object
     NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithCapacity:2];
     [mutableDictionary setObject:@"value1" forKey:@"key1"];
@@ -210,7 +211,7 @@ int main (int argc, const char * argv[])
     while (ii < 4)
     {
         NSLog(@"%d,", ii++); // ii++ increments ii in-place, after using its value
-    } // => prints "0," 
+    } // prints => "0," 
       //           "1,"
       //           "2,"
       //           "3,"
@@ -220,7 +221,7 @@ int main (int argc, const char * argv[])
     for (jj=0; jj < 4; jj++)
     {
         NSLog(@"%d,", jj);
-    } // => prints "0," 
+    } // prints => "0," 
       //           "1,"
       //           "2,"
       //           "3,"
@@ -230,7 +231,7 @@ int main (int argc, const char * argv[])
     for (NSNumber *value in values)
     {
         NSLog(@"%@,", value);
-    } // => prints "0," 
+    } // prints => "0," 
       //           "1,"
       //           "2,"
       //           "3,"
@@ -238,7 +239,7 @@ int main (int argc, const char * argv[])
     // Object for loop statement. Can be used with any Objective-C object type
     for (id item in values) { 
         NSLog(@"%@,", item); 
-    } // => prints "0," 
+    } // prints => "0," 
       //           "1,"
       //           "2,"
       //           "3,"
@@ -255,7 +256,7 @@ int main (int argc, const char * argv[])
     } @finally
     {
         NSLog(@"Finally. Time to clean up.");
-    } // => prints "Exception: File Not Found on System"
+    } // prints => "Exception: File Not Found on System"
       //           "Finally. Time to clean up."
 
     // NSError objects are useful for function arguments to populate on user mistakes. 
@@ -627,7 +628,7 @@ int main (int argc, const char * argv[]) {
 @end
 // Instances of Car now have access to the protocol. 
 Car *carInstance = [[Car alloc] init];
-[[carInstance setEngineOn:NO];
+[carInstance setEngineOn:NO];
 [carInstance turnOnEngine];
 if ([carInstance engineOn]) {
     NSLog(@"Car engine is on."); // prints => "Car engine is on."