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Why is this array being initialized in an odd way?


Why is this array being initialized in an odd way?

By : Sukhveer Kaur
Date : January 02 2021, 06:48 AM
should help you out The ith element of the array wl[] is the number of words of length i that have been found in an input file. The wl[] array needs to be zero-initialized first so that ++wl[nc]; does not cause undefined behavior by attempting to use an uninitialized variable, and so that array elements that represent word lengths that are not present reflect that no such word lengths were found.
Note that ++wl[nc] increments the value wl[nc] when a word of length nc is encountered. If the array were not initialized, the first time the code attempts to increment an array element, it would be attempting to increment an indeterminate value. This attempt would cause undefined behavior.
code :
int wl[MAXWORD] = { 0 };


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Array initialized at declaration not actually initialized until after call to super constructor

Array initialized at declaration not actually initialized until after call to super constructor


By : Anil Kumar
Date : March 29 2020, 07:55 AM
Hope that helps The superclass constructor must finish successfully before the rest of the subclass constructor begins. Only then will subclass variables be initialized, so during the superclass constructor, a in Bar is still null. This curious situation arises because a method called by a superclass constructor is overridden in the subclass, so a subclass method is called before the subclass is itself initialized.
For more info on why it's bad Java leaking this in constructor. This lets an object that is not fully initialized be accessible to other objects.
Unexpected behavior using Array Map on an Array Initialized with Array Fill

Unexpected behavior using Array Map on an Array Initialized with Array Fill


By : user2926348
Date : March 29 2020, 07:55 AM
With these it helps I've ran into an issue with the new Array.prototype.fill method due to unexpected output when using it with Array.prototype.map. For example: , Your code is equivalent to:
code :
let inner = Array(3).fill(0);
let M = Array(3).fill(inner);
let M = [];
for (var i = 0; i < 3; i++) {
    M.push(Array(3).fill(0));
}
Update initialized Data in array with variable then pass array to next view controller

Update initialized Data in array with variable then pass array to next view controller


By : milorojaz
Date : March 29 2020, 07:55 AM
Does that help I have tried here. I got list of row numbers having more than 0 order. I have it stored in whichRowToBeAdd. If user decreased to Zero, respective rows will removed from this array.
With the help of Singleton Class, we can store whatever we need to show in NextViewController
code :
var whichRowToBeAdd = [Int]() // GLOBAL

@IBAction func stepperAcn(_ sender: UIStepper) {

//change label value with stepper
let cellPosition = sender.convert(CGPoint.zero, to: service2TableView)
let indPath : IndexPath = service2TableView.indexPathForRow(at: cellPosition)!


    if Int(sender.value) == 0
    {
        if whichRowToBeAdd.contains(indPath.row)
        {
            whichRowToBeAdd.remove(at: whichRowToBeAdd.index(of: indPath.row)!)
        }
        else
        {

        }
    }
    else
    {
        if whichRowToBeAdd.contains(indPath.row)
        {

        }
        else
        {
            whichRowToBeAdd.append(indPath.row)
        }
    }

//.... 
//..... Your Code in your answer


}

// After stepper Action, final click of Button, which moves to Next ViewController
@IBAction func goToConfirmOrder(_ sender: UIBarButtonItem) { 

    print("\n\n Val_    ", whichRowToBeAdd)

    singleTon.sharedInstance.orderDict.removeAll()

    for i in 0..<whichRowToBeAdd.count
    {
        let indPath = IndexPath(row: whichRowToBeAdd[i], section: 0)

        let newCell = tblVw.cellForRow(at: indPath) as! Service2TableViewCell
        print("qweqwe      ",newCell.testLbl.text)

        let name : String = newCell.service2Title.text!
        let image : UIImage = newCell.service2Image.image
        let quantity : Int = Int(newCell.service2StepperLbl.text!)!

        getOrderOneByOne(productName: name, productImage: image, productQuantity: quantity)

        if i == (whichRowToBeAdd.count - 1)
        {
            self.performSegue(withIdentifier: "confirmOrderVC", sender: nil)
        }
    }

}

func getOrderOneByOne(productName: String, productImage : UIImage, productQuantity: Int)
{


    let createDict = ["productName" : productName, "productImage" : productImage, "productQuantity" : productQuantity] as [String : Any]

    singleTon.sharedInstance.orderDict.append(createDict)

}
class singleTon: NSObject {

    static let sharedInstance = singleTon() // Singleton Instance

    var orderDict = [[String : Any]]() // Dictionary Declaration
}
class ConfirmOrderViewController: UIViewController {
   override func viewDidLoad() {
     super.viewDidLoad()

     print("\n\norderDict.coun    ", singleTon.sharedInstance.orderDict)
   }
}
Array is not fully initialized with data extracted from json array using PUSH & SHIFT

Array is not fully initialized with data extracted from json array using PUSH & SHIFT


By : user2048244
Date : March 29 2020, 07:55 AM
this one helps. What your code those:
filling the arrays rssiArray and battArray with 12 zeros.
code :
rssiArray.unshift(rssi);
battArray.unshift(batt);
 <script>
    function dspChrt(Device_Data) { 
        console.log(Device_Data);

        var rssiArray = [];
        var battArray = [];
        for(var i=0; i<Device_Data.length; i++) {
            rssiArray.push(Device_Data[i].rssi);
            battArray.push(Device_Data[i].battery_voltage_mv);
        }

        console.log(rssiArray);
        console.log(battArray);
     }
 </script>
Why class variable of type array can't be initialized after declaration, but can be initialized inside a method in Java?

Why class variable of type array can't be initialized after declaration, but can be initialized inside a method in Java?


By : James Pence
Date : March 29 2020, 07:55 AM
I hope this helps . For code to be executed it must either be at the declaration of a variable, or inside a method. In your first example new int[5] is at the declaration of the instance variable, but array[5] = 10; is neither at the declaration nor in a method. In the second example both are in a method.
note: Arrays are zero based, array[5] will throw an IndexOutOfBoundsException. The minimum index is 0, the maximum 4, making 5 entries.
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