一行coffeescript“return if”迭代一个数组

Question

这是我的代码（不工作）

return monitor if (monitor.uuid is $scope.selectedMonitor) for monitor in $scope.monitors

如果if为真，我想返回监视器，我想在一行中做。可能吗？

Answer 1

您可以使用when关键字：

getSelectedMonitor = ->
  return monitor for monitor in $scope.monitors when monitor.uuid is $scope.selectedMonitor

这会生成以下JS：

var getSelectedMonitor = function() {
  var monitor, _i, _len, _ref;
  _ref = $scope.monitors;
  for (_i = 0, _len = _ref.length; _i < _len; _i++) {
    monitor = _ref[_i];
    if (monitor.uuid === $scope.selectedMonitor) {
      return monitor;
    }
  }
};