How do you insert a character into a string in Javascript?

How do you remove an item from the beginning of an array?

How do you add an item to the beginning of an array?

How do you find the index of an item in an array?

How do you remove an item from an array?

What does splice() do?

How would you remove two elements from a given index in an array?

What is the difference between slice and splice?

How do you test if an object is an array?

How do you change a string to uppercase in Javascript?

What does Array.map() do?

What does Array.from() do?

What does Array.reduce() do?

What does Array.filter() do?

Can you subclass an Array?