Unable to filter the non empty array data using lodash filter

问题

An array is as follows :

    const arr = [ { name: 'Aditya', hobbies: ['Football', 'Basketball'] }, 
                  { name: 'Amitabh', hobbies: [] },
                  { name: 'Akhsara', hobbies: ['Basketball'] },
                  { name: 'Aia', hobbies: [] }
                ];

Using filter function as follows:

     public getDatas(hobby) {        
      const data =  _.filter(arr, {hobbies : hobby === 'Unclear' : [] ? [hobby]} );     
    }

I have some how set the Unclear hobbies to empty arrays, when it is Unclear then it is NOT returning me the data with hobbies : [] instead it is returning me the whole of arr.

回答1:

The predicate (second argument) of _.filter indicates the property or properties to filter. Since hobbies is a string array, there is no hobby property of hobbies.

You can use Array.prototype.includes like this:

const data = _.filter(arr, item => item.hobbies.includes('Unclear'));

// If you want to extract just the 'hobbies' object, not the parent
const hobbies = _.map(data, 'hobbies');

来源：https://stackoverflow.com/questions/53856633/unable-to-filter-the-non-empty-array-data-using-lodash-filter