Cognizant Team Leader (Technical) Interview Questions and Answers

Inheritance in Kotlin allows a class to inherit properties and methods from another class.

• Use the 'open' keyword to mark the superclass as inheritable

• Use the 'override' keyword to override a method or property in the subclass

• Use the 'super' keyword to call the superclass's implementation of a method or property

• Example: class SubClass : SuperClass() { override fun method() { super.method() } }

To detect web browser, use navigator.userAgent property.

• Use navigator.userAgent property to get the user agent string.

• Parse the user agent string to identify the browser.

• Use conditional statements to execute browser-specific code.

• Consider using a library like Modernizr or jQuery to simplify the process.

Mixin is a way to reuse code in multiple classes without inheritance.

• Mixin is a programming concept that allows code to be reused in multiple classes without inheritance.

• It is achieved by including a module or class in another class.

• Mixins are commonly used in object-oriented programming languages like Ruby and Python.

• They help to reduce code duplication and improve code organization.

• Example: A class for a car may incl...read more

Closure is a feature in programming languages that allows a function to access variables outside its scope.

• Closure is a way to create a function inside another function and access the outer function's variables.

• It allows for encapsulation and data privacy.

• Closures are commonly used in event handlers and callbacks.

• Example: function outer() { let x = 10; function inner() { console.log(x); } return inner; } const closure