RedSol Software Tester Interview Questions and Answers

Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.

• Start from the first element and compare it with the next element

• If the next element is smaller, swap them

• Repeat this process for all elements in the array

• Continue this process until no more swaps are needed

A program to print all prime numbers

• Take input from user for range of numbers

• Loop through the range and check if each number is prime

• Print the prime numbers

Hashmap is a data structure that stores key-value pairs and allows constant time access to values based on their keys.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Examples of hashmap implementations include Java's HashMap class and Python's dict type.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add new properties and methods.

• For...read more

Recursion is a process in which a function calls itself. Inheritance is a mechanism in OOP where a class inherits properties of another class. Heap is a region of memory used for dynamic memory allocation.

• Recursion can be used to solve problems that can be broken down into smaller sub-problems.

• Inheritance allows for code reuse and helps in creating a hierarchy of classes.

• Heap is used for dynamic memory allocation in la...read more

Angular has several lifecycle methods that are called at different stages of a component's life.

• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngDoCheck() - called during every change detection cycle

• ngAfterViewInit() - called after the component's view has been initialized

• ngOnDestroy() - called just before the component is destroyed

Pipes are a feature in Angular that allow for data transformation before displaying it in the view.

• Pipes are used to format data in the view

• They can be used to filter, sort, and transform data

• Examples include the date pipe, currency pipe, and uppercase pipe

Global error handling in Angular can be done using ErrorHandler class.

• Create a class that implements the ErrorHandler interface

• Override the handleError() method to handle errors globally

• Provide the ErrorHandler class in the providers array of AppModule

• Use the error handling service to log errors or display error messages

Custom directives are a way to extend HTML with new attributes and functionality.

• Types of custom directives are attribute, element, and class directives.

• Attribute directives modify the behavior of existing HTML elements.

• Element directives create new HTML elements.

• Class directives modify the behavior of existing HTML elements based on their class.

• To create a custom directive, use the directive() method of the AngularJS ...read more