罗达什。 如果您知道数组键，如何从 object 获取数组值？

Question

For example, you have an object.

{ id: 1, firstName: 'John', lastName: 'Doe' }

How to get an array from the object if you know array keys? You have array keys

['firstName', 'lastName']

and you should get array

['John', 'Doe']

I use Lodash .

Answer 1

You don't need lodash.

Just use Array.prototype.map to get values from key array.

 const obj = { id: 1, firstName: 'John', lastName: 'Doe' }; const filterKey = ['firstName', 'lastName']; console.log('FILTERED:', filterKey.map(key => obj[key]));

Answer 2

You can you _.at() :

 const obj = { id: 1, firstName: 'John', lastName: 'Doe' }; const keys = ['firstName', 'lastName']; const result = _.at(obj, keys); console.log('RESULT:', result);

 <script src='https://cdn.jsdelivr.net/lodash/4.16.6/lodash.min.js'></script>

Answer 3

 const keys = Object.keys({ id: 1, firstName: 'John', lastName: 'Doe' }); const values = Object.values({ id: 1, firstName: 'John', lastName: 'Doe' }); console.log(keys) console.log(values)

You don't need to use Lodash, using plain javascript will do it. Use Object.keys() for getting all the keys of an object and Object.values() to get an array with all the values that an object has.

Answer 4

You can use Object.keys and Array.filter() to filter the keys you want.

 var filterKeys = ['firstName', 'lastName'] var obj = { id: 1, firstName: 'John', lastName: 'Doe' } var filteredObj = Object.keys(obj).filter(key => filterKeys.includes(key)).map(key => obj[key]) console.log(filteredObj);

Hope this helps