What is the difference between var, let, and const?

Explain == vs ===.

What is a callback function? Give a simple example.

How do you add an event listener to a button?

What is the DOM and how do you access an element by id? (document.getElementById('id'))

what is a singleton tag?

Question

What is the difference between var, let, and const?

Explain == vs ===.

What is a callback function? Give a simple example.

How do you add an event listener to a button?

What is the DOM and how do you access an element by id? (document.getElementById('id'))

what is a singleton tag?

Echelon Edge