Function useState

test/neverland.js:365–389

(value, options)

    always: false
  };
  var useState = function useState(value, options) {
    var state = current();
    var i = state.i++;
    var hook = state.hook,
        args = state.args,
        stack = state.stack;

    var _ref = options || defaults,
        sync = _ref.sync,
        always = _ref.always;

    if (stack.length <= i) {
      stack[i] = isFunction(value) ? value() : value;
      if (!updates.has(hook)) updates.set(hook, sync ? update : reraf());
    }

    return [stack[i], function (value) {
      var newValue = isFunction(value) ? value(stack[i]) : value;

      if (always || stack[i] !== newValue) {
        stack[i] = newValue;
        updates.get(hook)(hook, null, args);
      }
    }];
  };

  /*! (c) Andrea Giammarchi - ISC */
  var hooks = new WeakMap();