How to retrieve an array with value within another array?

Question

I'm trying to retrieve the array that has value within another array using filter method. So for instance, from this

[[], [{name:"shop", price: 48}],[]]

to this

[{name:"shop", price: 48}]

From console.log below I get {name:"shop", price: 48}, but when I return v, I get whole thing back--> [[], [{name:"shop", price: 48}],[]]

What am I missing?

const a = [[], [{name:"shop", price: 48}],[]]

const output = a.map((value) => {
  return value.filter((v) =>{
    console.log(v)
    return v
  })
})
console.log(output);

Your map function does nothing except cloning your initial array, so what do you expect? — connexo
– connexo, Commented Oct 15, 2020 at 0:51
What if several arrays are non-empty, what do you you expect in those cases? — connexo
– connexo, Commented Oct 15, 2020 at 0:56
If you want to filter out empty arrays, then apply such filter. — PM 77-1
– PM 77-1, Commented Oct 15, 2020 at 0:56

connexo · Accepted Answer · 2020-10-15 00:54:35Z

2

Are you looking for this?

const a = [[], [{name:"shop", price: 48}],[]]

const [ output ] = a.filter(v => v.length); // will filter out empty arrays

console.log(output);

answered Oct 15, 2020 at 0:54

connexo

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Comments

Rodrigo João Bertotti · Accepted Answer · 2020-10-15 01:04:57Z

1

My solution of joining subarrays into one array:

const a = [[], [{name:"shop", price: 12}], [{name:"shop", price: 34}]];

let res = [];
a.forEach((aItem) => res = res.concat(aItem));

console.log(res);

Output

[ { name: 'shop', price: 12 }, { name: 'shop', price: 34 } ]

answered Oct 15, 2020 at 1:04

Rodrigo João Bertotti

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