Catalyst 2030 Interview Questions and Answers

Asynchronous functions in JavaScript allow code to run without blocking other code from executing.

• Asynchronous functions use callbacks or promises to handle the result of the function.

• They are useful for tasks that may take a long time to complete, such as fetching data from a server.

• Examples include setTimeout(), fetch(), and XMLHttpRequest().

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A parent class Animal can have child classes like Dog, Cat, and Cow. All of them have a common method called 'makeSound', but each of them makes a different sound.

• Example: A method can be overloaded by having the same name but different parameters, ...read more

Reverse alternate words in a given string

• Split the string into words

• Reverse alternate words using a loop

• Join the words back into a string

Use a hashmap to store the frequency of each letter in the given string.

• Iterate through the string and update the frequency of each letter in the hashmap.

• Return the hashmap containing the frequency of each letter.