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@ -3,42 +3,22 @@ export function debounce<T extends any[], R>(
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wait = 1000,
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immediate = false
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) {
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// 'private' variable for instance
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// The returned function will be able to reference this due to closure.
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// Each call to the returned function will share this common timer.
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let timeout: NodeJS.Timeout | null;
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// Calling debounce returns a new anonymous function
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return function () {
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// reference the context and args for the setTimeout function
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const args = arguments;
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// Should the function be called now? If immediate is true
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// and not already in a timeout then the answer is: Yes
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const callNow = immediate && !timeout;
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// This is the basic debounce behavior where you can call this
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// function several times, but it will only execute once
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// [before or after imposing a delay].
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// Each time the returned function is called, the timer starts over.
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clearTimeout(timeout ?? undefined);
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// Set the new timeout
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timeout = setTimeout(function () {
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// Inside the timeout function, clear the timeout variable
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// which will let the next execution run when in 'immediate' mode
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timeout = null;
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// Check if the function already ran with the immediate flag
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if (!immediate) {
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// Call the original function with apply
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// apply lets you define the 'this' object as well as the arguments
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// (both captured before setTimeout)
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func.apply(this, args);
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}
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}, wait);
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// Immediate mode and no wait timer? Execute the function..
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if (callNow) func.apply(this, args);
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} as (...e: T) => R;
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}
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