throttle.js

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- # throttle.js

- ¶

      import now from './now.js';

- ¶

  Returns a function, that, when invoked, will only be triggered at most once during a given window of time. Normally, the throttled function will run as much as it can, without ever going more than once per `wait` duration; but if you’d like to disable the execution on the leading edge, pass `{leading: false}`. To disable execution on the trailing edge, ditto.

      export default function throttle(func, wait, options) {
        var timeout, context, args, result;
        var previous = 0;
        if (!options) options = {};

        var later = function() {
          previous = options.leading === false ? 0 : now();
          timeout = null;
          result = func.apply(context, args);
          if (!timeout) context = args = null;
        };

        var throttled = function() {
          var _now = now();
          if (!previous && options.leading === false) previous = _now;
          var remaining = wait - (_now - previous);
          context = this;
          args = arguments;
          if (remaining <= 0 || remaining > wait) {
            if (timeout) {
              clearTimeout(timeout);
              timeout = null;
            }
            previous = _now;
            result = func.apply(context, args);
            if (!timeout) context = args = null;
          } else if (!timeout && options.trailing !== false) {
            timeout = setTimeout(later, remaining);
          }
          return result;
        };

        throttled.cancel = function() {
          clearTimeout(timeout);
          previous = 0;
          timeout = context = args = null;
        };

        return throttled;
      }