A simple debounce higher order function

debounce.js

/**
 * Creates a new function that will run the callback a maximum of once at the end of the timeout period.
 * Useful for using with event listeners that fire often. The opposite of throttling.
 *
 * @param delay The length of time in ms before firing the callbcak
 * @param callback The callback to fire once the time has passed
 */
export function debounce(delay, callback) {
    let _args;
    let _running = false;
    return (...args) => {
        _args = args;
        if (_running) {
            return;
        }
        _running = true;
        setTimeout(() => {
            // Allow another timeout to be created as this will be fired
            _running = false;
            // Now call the callback with the last args stored
            callback(..._args);
        }, delay);
    };
}

debounce.ts

/**
 * Creates a new function that will run the callback a maximum of once at the end of the timeout period.
 * Useful for using with event listeners that fire often. The opposite of throttling.
 *
 * @param delay The length of time in ms before firing the callbcak
 * @param callback The callback to fire once the time has passed
 */
export function debounce(delay, callback) {
    let _args;
    let _running = false;
    return (...args) => {
        _args = args;
        if (_running) {
            return;
        }
        _running = true;
        setTimeout(() => {
            // Allow another timeout to be created as this will be fired
            _running = false;
            // Now call the callback with the last args stored
            callback(..._args);
        }, delay);
    };
}