Throttle Function

Creates a throttled version of a callback that ensures it executes at most once every specified interval. Ideal for controlling calls on rapid, repeat events like scrolling or resizing.

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Import

import { throttleAction } from 'nhb-toolbox';

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Function Signature

function throttleAction<T extends VoidFunction>( callback: T, delay?: number): ThrottledFn<T>

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Usage Examples

Throttle Window Resize

const throttledResize = throttleAction(() => {
  console.log('Resized!');
}, 300);

window.addEventListener('resize', throttledResize);
// Logs at most once every 300ms while resizing.

Scroll Events

const throttledScroll = throttleAction((e: Event) => {
  handleScroll(e);
}, 200);

window.addEventListener('scroll', throttledScroll);

Default Delay

const log = throttleAction(() => console.log('Ready!'));
// Uses default delay of 150ms
log();

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API Reference

Type Definitions

/** Generic function type that returns `void` */
type VoidFunction = (...args: any[]) => void;

/** Debounced function type after certain delay */
type ThrottledFn<T extends VoidFunction> = (...args: Parameters<T>) => void;

Parameters

Name	Type	Description
callback	VoidFunction	The function to throttle.
delay	number	Delay in milliseconds (default: 150).

Returns

A throttled version of the callback, invoked at most once per interval.

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Key Features

1. Generic: Works with any callback signature.
2. Prevents Flooding: Ensures even spacing between calls.
3. Custom or Default Interval: Default 150ms interval or specify custom.

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Limitations

1. No Trailing Calls: Only leading edge execution; trailing invocation is not supported.
2. No Cancel/Flush: Does not support canceling or flushing scheduled calls.
3. No Context Retention: this is not bound or managed.

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Notes

• Use throttle for scroll, resize, or mouse-move events to protect performance.
• Use debounce for “do X after no more triggers”; throttle for “do X at regular intervals”.
• Please refer to debounceAction to debounce an action or function.

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Recommended Use Cases

• Window resize or scroll listeners.
• Animation frame limiting.
• Preventing button mashing event floods.

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Conclusion:
throttleAction is the go-to for managing high-frequency events and protecting performance in your web apps.