如何在 lodash 过滤器中保留对象键

Question

I have an array

const sampleObject = {Color: "Blue", Size: "39, 41"}

Using Lodash's _.filter when I try

_.filter(sampleObject, (entry) => entry !== 'Blue')

I get

['39, 41']

But my desired result is

{Size: '39, 41'}

 const sampleObject = { Color: "Blue", Size: "39, 41" } const filtered = _.filter(sampleObject, (entry) => entry !== 'Blue') console.log(filtered);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js"></script>

Answer 1

Are you looking for _.pickBy() ?

 const sampleObject = { Color: "Blue", Size: "39, 41" } const filtered = _.pickBy(sampleObject, (value,key) => value !== 'Blue') console.log(filtered);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js"></script>

Answer 2

Seems odd you need to do this, but you can use fromEntries and entries to do it

 const sampleObject = {Color: "Blue", Size: "39, 41"} const result = Object.fromEntries(Object.entries(sampleObject).filter(x => x[1] !== 'Blue')); console.log(result);

Answer 3

If you want just that one property in a new object, grab it directly:

 const sampleObject = {Color: "Blue", Size: "39, 41"}; const result = {Size: sampleObject.Size}; console.log(result);

Or if you need the key to be dynamic:

 const sampleObject = {Color: "Blue", Size: "39, 41"}; const key = "Size"; const result = {[key]: sampleObject[key]}; console.log(result);