Write debounce from scratch

A debounced function waits until the calls stop coming before it actually runs.

Implement debounce(fn, wait) returning a new function that delays calling fn until wait milliseconds have passed without another call.

What it has to do

• Reset the timer every time the debounced function is called again.
• Call fn with the arguments from the most recent call.
• Preserve this when the debounced function is used as a method.
• Expose a .cancel() that stops a pending call.

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