Swift ?? operator

The nil coalescing operator (a ?? b) unwraps an optional a if it contains a value, or returns a default value b if a is nil.

Matlab: centroids using Kmeans

 [IDX,C] = kmeans(x,3)

c will give the centroids

Merge commit from one branch to another in bitbucket

git cherry-pick commitNumber

Wrapping Google Analytics in Swift

import Foundation

@objc enum MyEventCategory: Int {

    case Category1

    case Category2

}

@objc enum MyEventAction: Int {

   case Action1

   case Action2

   

}

@objc class MyAanalytics  {

    

    func getMyCategory(category: MyEventCategory) -> String {

        return String(stringInterpolationSegment: category)

        

    }

    func getMyAction(action: MyEventAction) -> String {

        return String(stringInterpolationSegment: action)

    }

    func trackEvent(category: MyEventCategory, action: MyEventAction) {

        var label: String, value: NSNumber?

        label = "Any label" // whatever label you want to give

        value = nil

        

        let tracker = GAI.sharedInstance().defaultTracker

        let trackDictionary = GAIDictionaryBuilder.createEventWithCategory(self.getMyCategory(category), action: self. getMyAction(action), label: label, value: value).build()

        tracker.send(trackDictionary as [NSObject : AnyObject])

    }

}

Conditional unwrapping in swift using where clause

checking the optional bool variable as well as that is that variable is true or not


if canPlay = self.dataSource?.functiion() where canPlay= true {

}

Removing conflicts during merging two branches on bitbucket

On terminal

 $git status

remove untracked files if exists

$rm -rf fileWithFullAddress

$git status 

Repeat above till get clean directory

$git checkout FinalDestinationBranchForMerging

$git pull // get update for local branc

Now merge the other branch with it

$git merge MergingBranch

It will show the files having conflicts. Files will get -- head tags 

open Editor, make the changes

After making changes

$ git add ChangedFileWithAddress

$ git status

If need to remove/reset some file from the project 

$ git rest FileToBeRemoved

$ git add -A

$ git status

$ git commit -m 'The message I got while merging the branches'

$ git push

Done

IOS: Delegate and Datasource Swift and objective-c interaction

Delegate will be defined in the class from where the event need to be triggered
For example:
if class name is MyClass in swift

delegate will be defined as

@objc protocol MyClassDelegate: NSObjectProtocol {

    func myClass(myclass: MyClass, myFunction parameter: Parameter)

    

}

if some data is required in the class, the data source is defined as

@objc protocol MyClassDataSource: class {

     func myClass(myClass: MyClass, myFunction parameter: Parameter) -> data?  // like UUImage

}

------- in class implementation

var delegate: MyClassDelegate?

var dataSource : MyClassDataSource?

self.delegate?.myClass(self, myFunction: whateverParameter)

self.dataSource?.myClass(self)

----- using in objective-c

#pragma mark - AudioNoteViewModelControllerDelegate

@interface ObjectivecClass (MyClassDelegate) <AudioNoteViewModelControllerDelegate>

@end

@implementation ObjectivecClass (MyClassDelegate)

-(void) myClass:(MyClass *) myclass myFunction:(Parameter *) parameter  {

}

@end

#pragma mark - AudioNoteViewModelControllerDataSource

@interface ObjectivecClass (MyClassDataSource) <AudioNoteViewModelControllerDataSource>

@end

@implementation ObjectivecClass (MyClassDataSource)

-(Data *) myClass:(MyClass *) myclass myFunction: (Parameter *) parameter {

}

@end

-- in ObjectivecClass  interface

@property (nonatomic, strong) MyClass * myClass;

--- in ObjectivecClass implementation viewDidLoad

     _myClass = [MyClass new];

    _myClass.delegate = self;

    _ _myClass.dataSource = self;