javascript 在数组中的对象之间保留某些属性

Question

我想从数组中的对象中删除每个属性，除了其中一些属性:

var listToKeep = ['name', 'school'];

var arrayOfObjects = [{id:'abc',name:'oh', school: 'a', sport: 'a'},
                      {id:'efg',name:'em', school: 'b', sport: 's'},
                      {id:'hij',name:'ge', school: 'c', sport: 'n'}]

我正在尝试这样做，但这只是尝试删除一个:

arrayOfObjects .forEach(function(v){ delete v.id});

预期结果是:

var arrayOfObjects = [{name:'oh', school: 'a'},
                          {name:'em', school: 'b'},
                          {name:'ge', school: 'c'}]

我不想使用for循环。

Answer 1

您可以将数组中的每一项映射到新的一项，这是通过减少要保留的键列表来创建的:

const newArray = arrayOfObjects.map(obj => listToKeep.reduce((newObj, key) => {
  newObj[key] = obj[key]
  return newObj
}, {}))

如果要改变原始对象并删除属性，可以使用两个 forEach 循环和删除运算符:

arrayOfObjects.forEach(obj => listToKeep.forEach((key) => {
  delete obj[key]
}, {}))

如果您可以使用lodash或类似的库，您可以选择对象的属性，例如:

const newArray = arrayOfObjects.map(obj => _.pick(obj, listToKeep))