Find array in another array and get index of result

Question

I have this array:

    var arr = [
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Nessuno"}, {name: "Tegole", slug: "tegole", option: "Senza Tegole"}], id:430, price:"1000"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Nessuno"}, {name: "Tegole", slug: "tegole", option: "Rossi"}], id:431, price:"1025"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Nessuno"}, {name: "Tegole", slug: "tegole", option: "Verdi"}], id:432, price:"1025"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Trasparente"}, {name: "Tegole", slug: "tegole", option: "Senza Tegole"}], id:433, price:"1100"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Trasparente"}, {name: "Tegole", slug: "tegole", option: "Rossi"}], id:434, price:"1125"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Trasparente"}, {name: "Tegole", slug: "tegole", option: "Verdi"}], id:435, price:"1125"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Noce"}, {name: "Tegole", slug: "tegole", option: "Senza Tegole"}], id:436, price:"1100"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Noce"}, {name: "Tegole", slug: "tegole", option: "Rossi"}], id:437, price:"1125"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Noce"}, {name: "Tegole", slug: "tegole", option: "Verdi"}], id:438, price:"1125"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Castagno"}, {name: "Tegole", slug: "tegole", option: "Senza Tegole"}], id:439, price:"1100"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Castagno"}, {name: "Tegole", slug: "tegole", option: "Rossi"}], id:440, price:"1125"},
{attributes: [{name: "Impregnante", slug: "impregnante", option: "Castagno"}, {name: "Tegole", slug: "tegole", option: "Verdi"}], id:441, price:"1125"}]

And another array:

var obj =  [{name: "Impregnante", slug: "impregnante", option: "Trasparente"}, {name: "Tegole", slug: "tegole", option: "Rossi"}];

Can someone give me an advice, how to find the obj in arr and return the id where obj was... Thx in advance and so sorry for the language!!!

mejiajuanbta · Accepted Answer · 2017-10-20 02:45:47Z

1

I think this can help you:

Get the object:

var arrFilter = arr.filter(function(a, b){ return JSON.stringify(a.attributes) == JSON.stringify(obj) });

// if you need the property ID
arrFilter[0].id

Get the index:

var idx = arr.findIndex(function(a, b){ return JSON.stringify(a.attributes) == JSON.stringify(obj) })

If you want, you can use Arrow functions (Lambda expressions).

answered Oct 20, 2017 at 2:45

mejiajuanbta

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Comments

dhilt · Accepted Answer · 2017-10-20 02:50:54Z

0

Try following:

const parseData = (arr, obj) => {
  let found = arr.find(a => JSON.stringify(a.attributes) === JSON.stringify(obj));
  return found ? found.id : null;
}

console.log(parseData(arr, obj)); //434

To provide objects shallow comparison I used JSON.stringify(). This approach requires strict order of attributes of objects involved in the operation. You may implement such a comparison in some another way, if this requirement isn't acceptable.

edited Oct 20, 2017 at 2:50

answered Oct 20, 2017 at 2:31

dhilt

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3 Comments

Letizia Rossi Over a year ago

Thx, its working nice, but, what if i have this array like var obj2 = [{option: "Trasparente"}, {option: "Rossi"}]

dhilt Over a year ago

Just make a comparison strict : let found = arr.find(a => a.attributes[0].option === obj[0].option && a.attributes[1].option === obj[1].option); -- depends on your need, the comparator could be customized in a hundred ways

Letizia Rossi Over a year ago

Thx, the solution was simply, but im so novice in this programming language. Thx again!

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