Returns a function that as long as it continues to be called, it will not be invoked. It will only be called after `time` milliseconds.

debounce.js

function debounce(fn, time) {
  var time = time || 300,
      scope = this,
      delay;

  return function() {
    var args = arguments;

    if (delay) clearTimeout(delay);
    delay = setTimeout(function() {
      fn.apply(scope, args);
    }, time);
  }
}

example.js

$("input").on("keyup", debounce(function() {
  $.get("/search", { query: $(this).val() }, updateSearchResults);
}));

tests.js

var callTimes = 0;

function fn() {
  callTimes += 1;
  if (callTimes > 1) console.assert(false, "Expected only one call, but was called "+ callTimes +" times");
}

var debouncedFn = debounce(fn, 0);

debouncedFn();
debouncedFn();
debouncedFn();