What is Cocoa and cocoa touch?

Correct Answer: ello

Explanation:

deleteCharAt() method deletes the character at the specified index location and returns the resulting StringBuffer object.

So after deleting the character at 0 ie 'H', the string returns 'ello' as the output.

Correct Answer: StringBuffer(int size , String str)

Correct Answer: Immutable classes are Java classes whose objects can not be modified once created Any modification in Immutable object result in new object For example is String is immutable in Java Mostly Immutable are also final in Java, in order to prevent sub class from overriding methods in Java which can compromise Immutability You can achieve same functionality by making member as non final but private and not modifying them except in constructor

Correct Answer: 'ViewState' is specific to a page in a session 'SessionState' is specific to user specific data that can be accessed across all pages in the web application

Correct Answer: There are lots of ways to solve the issue of callback hells: 1 Modularization: break callbacks into independent functions 2 Use a control flow library, like async 3 Use generators with Promises 4 Use async/await (note that it is only available in the latest v7 release and not in the LTS version)

Correct Answer: An app can get into InActive state when the user locks the screen or the system prompts the user to respond to some event eg SMS message, incoming call etc

Correct Answer: IOS development requires Intel-based Macintosh computer and iOS SDK

Correct Answer: ARC is a compiler-level feature that simplifies the process of managing the lifetimes of Objective-C objects Instead of you having to remember when to retain or release an object, ARC evaluates the lifetime requirements of your objects and automatically inserts the appropriate method calls at compile time

Correct Answer: ARC is a compiler-level feature that simplifies the process of managing the lifetimes of Objective-C objects Instead of you having to remember when to retain or release an object, ARC evaluates the lifetime requirements of your objects and automatically inserts the appropriate method calls at compile time

Correct Answer: The security laws which are implements to secure data in the cloud are as follows: - Input validation : controls the input data which is being to any system - Processing : control that the data is being processed correctly and completely in an application - File : control the data being manipulated in any type of file - Output reconciliation : control the data that has to be reconciled from input to output - Backup and recovery: control the security breaches logs and the problems which has occurred while creating the back