Apple Front End Developer interview questions

Endianness; deciding between inheritance and composition

1. Find the position of first duplicate element in a string. 2. Concatenate two array and find the unique element from it. 3. Input array [3,4,5] output array [20, 15,12] 4. What is promise, how can you execute array of promise sequence by sequence- use generator concept 5. How to build a npm package That's it, All the best.