799 B
799 B
importance: 5
Debounce decorator
The result of debounce(f, ms) decorator should be a wrapper that passes the call to f at maximum once per ms milliseconds.
In other words, when we call a "debounced" function, it guarantees that all other future in the closest ms milliseconds will be ignored.
For instance:
let f = debounce(alert, 1000);
f(1); // runs immediately
f(2); // ignored
setTimeout( () => f(3), 100); // ignored ( only 100 ms passed )
setTimeout( () => f(4), 1100); // runs
setTimeout( () => f(5), 1500); // ignored (less than 1000 ms from the last run)
In practice debounce is useful for functions that retrieve/update something when we know that nothing new can be done in such a short period of time, so it's better not to waste resources.