PRACTICE STUDIO
Get comfortable saying it out loud.
Pick a question, type your answer, and get actionable AI feedback. The timer runs while you practice.
TechnicalBeginner
What is the difference between a variable and a constant?
Example answer
A variable can be reassigned after declaration; a constant cannot be reassigned. In JavaScript, let declares a reassigned binding and const prevents reassignment of the binding.
AI-generated feedback
Pick a question, type your answer, and get actionable AI feedback. The timer runs while you practice.