Ciklum Interview Questions and Answers

Use bitwise XOR operation to find the missing number in O(N) time complexity.

• Iterate through the array and XOR all the elements with their indices and the array length.

• The missing number will be the result of XORing all the elements with their indices and the array length.

Use two pointers to swap characters in place

• Initialize two pointers, one at the beginning of the string and one at the end

• Swap characters at the two pointers and move them towards each other until they meet or cross

• Repeat the process until the entire string is reversed

To connect MongoDB with a database, you need to use the MongoDB URI and a MongoDB client library.

• Use the MongoDB URI to specify the connection details such as host, port, username, password, and database name

• Install a MongoDB client library like Mongoose for Node.js or pymongo for Python

• Use the client library to establish a connection to the MongoDB database and perform CRUD operations

Program to check if a string is an Anagram or not

• Create a function that takes in two strings as input

• Sort the characters in both strings and compare if they are equal

• Return true if they are anagrams, false otherwise

An event listener is a function that waits for a specific event to occur and then triggers a response.

• Event listeners are commonly used in web development to handle user interactions like clicks, keypresses, etc.

• They are attached to specific elements and listen for events to occur on those elements.

• Once the event occurs, the listener executes a callback function to respond to the event.

• Example: Adding a click event listener to a button element to perform an action when the bu...read more