PwC Software Engineer Interview Questions and Answers

Use Stream API to reverse a sentence

• Split the sentence into words using split() method

• Convert the array of words into a Stream using Arrays.stream()

• Use Stream API operations like map(), collect() and joining() to reverse the sentence

React hooks are functions that let you use state and other React features in functional components.

• useState: allows functional components to have local state

• useEffect: allows side effects in functional components

• useContext: allows functional components to access context

• useReducer: alternative to useState for more complex state logic

• useMemo: memoizes the result of a function

• useCallback: memoizes a callback function

• ...read more

Var is function scoped, let is block scoped in JavaScript.

• Var is function scoped, let is block scoped

• Var can be redeclared, let cannot

• Var is hoisted to the top of the function, let is not

• Use let for block-level variables, var for function-level variables

public static void main is the entry point of a Java program

• public: access modifier that allows the main method to be accessed from anywhere

• static: indicates that the main method belongs to the class and not to an instance of the class

• void: indicates that the main method does not return any value

• main: the name of the method that serves as the entry point of the program

• String[] args: an array of strings that can be...read more

Remove duplicates in array

• Use a hash table to keep track of seen elements

• Sort the array and remove duplicates in a single pass