let: Used to declare variables that can be reassigned new values

let: Used to declare variables that can be reassigned new values
if: Used to conditionally execute code based on a boolean expression
setInterval(): Used to repeatedly call a function at a specified interval
clearInterval(): Used to stop the execution of a function that was previously started with setInterval()
addEventListener(): Used to attach event listeners to DOM elements, allowing us to execute code in response to user interactions

Stopwatch

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