Implement a throttle function that takes a callback function and a delay time (in milliseconds) as arguments. The throttled function should ensure that the callback is executed at most once in the specified time period, regardless of how many times it's called.
Unlike debounce (which resets the timer with each call), throttle guarantees function execution at regular intervals while calls are being made.
Example
const throttledFn = throttle(() => console.log('Function called!'), 1000);
// If called multiple times in quick succession
throttledFn(); // Executes immediately
throttledFn(); // Ignored
throttledFn(); // Ignored
// ... after 1000ms
throttledFn(); // Executes
throttledFn(); // Ignored
Constraints
- The function should execute immediately on the first call
- Subsequent calls within the delay period should be ignored
- After the delay period, the next call should execute immediately
- The throttled function should return the result of the callback function
