EPAM Systems Sr Developer interview questions

1st round: 1. Basic JS and React questions 2. Flatten a multidimensional array without using inbuilt function 3. Convert class based life cycle methods to functional life cycle hooks. 2nd round: 1. Multiple questions on this object like what is this, they asked me find the value of this on from the JS snippets. 2. Merge a two sorted arrays 3. Filter based on the id and sum the no of quantities from the array of objects 4. Create basic timer component using functional component 5. Then typical react interview questions.