Core client-side questions covering modern ES6 syntax, asynchronous microtasks, DOM events, and React component state.
Event propagation happens in three phases: Capturing (event trickles down from window to target), Target, and Bubbling (event bubbles up from target back to window). Standard event listeners attach to the bubbling phase unless the third argument { capture: true } is passed.
Debouncing ensures a function is not called until a specified delay has elapsed since the last time it was invoked (e.g. search input autocomplete). Throttling guarantees a function is executed at most once within a specified time interval (e.g. window resize or scroll tracking).
function debounce(fn, delay) {
let timer;
return function (...args) {
clearTimeout(timer);
timer = setTimeout(() => fn.apply(this, args), delay);
};
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