node.js - 如何根据项目是否是对象的键从另一个列表创建项目列表？ (洛达什首选)

Question

如何以更 Eloquent 方式表达这一点，最好使用 Lodash:

anObject = {
  'a': 'apple',
  'b': 'banana'
};
largeArray = ['a', 'c', 'd'];
emptyArray = [];

for (var s = 0; s < largeArray.length; s++) {
  if (anObject[largeArray[s]]) {
    emptyArray.push(anObject[largeArray[s]]);
  }
}

console.log(emptyArray)

应该给我:

emptyArray = ['a']

Answer 1

您可以获得intersection()来自 largeArray 和 keys()从 anObject 变量来完成此操作。

_.intersection(largeArray, _.keys(anObject));

var anObject = {'a': 'apple', 'b': 'banana'};
var largeArray = ['a','c','d'];

var emptyArray = _.intersection(largeArray, _.keys(anObject));

console.log(emptyArray);

<script src="https://cdn.jsdelivr.net/lodash/4.13.1/lodash.min.js"></script>