Javascript round: 1. Create a function to join an array of words with spaces in between 2. Create a function to capitalise the words in a sentence 3. Create a function to reverse a string 4. Create a function that composes an array of functions into one function React questions: 1. Make a child component's input field value accessible to a parent component 2. Handle on submit logic of child component using callbacks from parent component 3. Show/hide components and customise styling depending on state
