Question

我有一个这样的对象数组：

const opts_timeline = [
      {
        type: {...},
        stimulus: ''
      },
      {
        type: {...},
        stimulus: ''
      },
      {
        timeline: [{type: {...}, stimulus: ''}],
        timeline_variable: [{...}, {...}]
      },
      {
        type: {...},
        stimulus: ''
      },
    ]

其中的type对象是这样的：

type: {
  info: {name: '', preloads: ''},
  stimulus: ''
}

我想遍历此数组并在type对象中检索一些属性，我尝试了forEach方法：

opts_timeline.forEach(multiple_trials => {
      if (!multiple_trials.hasOwnProperty('type')) {
        multiple_trials.timeline.forEach(trial => {
          var preloads = trial.type.info.preloads;
          if (typeof preloads !== 'undefined') {
            for (var i = 0; i < preloads.length; i++) {
              var type = trial.type.info.name;
              var param = preloads[i].parameter;
              var media = preloads[i].media_type;
              var func = preloads[i].conditional_function;
              var trials = timeline.trialsOfType(type);
              // ...
            }
          }
        })
      } else {
        var preloads = multiple_trials.type.info.preloads;
        if (typeof preloads !== 'undefined') {
          for (var i = 0; i < preloads.length; i++) {
            var type = multiple_trials.type.info.name;
            var param = preloads[i].parameter;
            var media = preloads[i].media_type;
            var func = preloads[i].conditional_function;
            var trials = timeline.trialsOfType(type);
            // ...
          }
        }
      }
    });

但是这段代码似乎多余。无论如何，有没有对其进行优化，或者将其中的一些分离成一个辅助函数？谢谢！

Answer 1

似乎可以简化以下操作：

  opts_timeline.forEach(multiple_trials => {
    (multiple_trials.timeline || [multiple_trials]).forEach(trial => {
      var preloads = trial.type.info.preloads;
      if (typeof preloads !== 'undefined') {
        for (var i = 0; i < preloads.length; i++) {
          var type = trial.type.info.name;
          var param = preloads[i].parameter;
          var media = preloads[i].media_type;
          var func = preloads[i].conditional_function;
          var trials = timeline.trialsOfType(type);
          // ...
        }
      }
    })
  });

如果有时间表，请对其进行迭代，否则，将试验包装在数组中并对其进行迭代。

遍历此对象数组的最佳方法是什么？

1 个答案: