从JS对象中删除键值为空数组

Question

I'm trying to remove keys from an object where the values is Array(0). Here's the object:

{fruit: Array(1), dairy: Array(2), vegetables: Array(0)}

This is the desired result:

{fruit: Array(1), dairy: Array(2)}

So far, I've been playing with the delete operator and .filter/.reduce methods.

Any help would be awesome :)

Answer 1

Just iterate over the keys of the object, check if the value for that key is an empty array and if so, delete it:

 let obj = { a: [1], b: [], c: 5, d: false } for (const key in obj) { if (Array.isArray(obj[key]) && !obj[key].length) delete obj[key] }; console.log(obj); 

Answer 2

The filter/reduce operators are for Arrays not for objects. If you must use the filter/reduce operators, you can try:

 const obj = {a: [1], b: [1,2], c: []}; const filtered = Object.keys(obj) .filter(key => Array.isArray(obj[key]) && obj[key].length != 0) .reduce((acc, key) => {acc[key] = obj[key]; return acc}, {}); console.log(filtered);