Java script filter on array of objects and push result's one element to another array

Question

I have a array called data inside that array I have objects. An object structure is like this

{
id:1,
especial_id:34,
restaurant_item:{id:1,restaurant:{res_name:'KFC'}}
}

I want to pass a res_name eg:- KFC

I want an output as a array which consists all the especial_ids

like this myarr = [12,23,23]

I could do something like this for that. But I want to know what is more elegant way to do this.

const data = [
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'McDonalds'}},
  
  {id:1,especial_id:8,restaurant_items:{id:5,res_name:'Kfc'}},
  
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Sunmeal'}},
  
   {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Kfc'}},
];

let temp = data.filter(element => element.restaurant_items.res_name == 'kfc')

let myArr = [];

temp.forEach(element=> myArr.push(element.especial_id));

console.log(myArr)//[8,6]

just use let myArry = data.filter(element => element.restaurant_items.res_name == 'kfc') — dotconnor
– dotconnor, Commented Nov 9, 2018 at 9:03
After "filter", instead of forEach you can directly use "map" to get especial ids. You can check my answer. — Nitish Narang
– Nitish Narang, Commented Nov 9, 2018 at 9:15

Nitish Narang · Accepted Answer · 2018-11-09 09:11:02Z

1

You can try this. It uses "Array.filter" and "Array.map"

var data = [
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'McDonalds'}},
  
  {id:1,especial_id:8,restaurant_items:{id:5,res_name:'Kfc'}},
  
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Sunmeal'}},
  
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Kfc'}},
];

function getEspecialIdsByName(name) {
  return data.filter(d => d.restaurant_items.res_name.toLowerCase() == name.toLowerCase())
             .map(d => d.especial_id)
}

console.log(getEspecialIdsByName('Kfc'))

console.log(getEspecialIdsByName('Sunmeal'))

edited Nov 9, 2018 at 9:11

answered Nov 9, 2018 at 9:05

Nitish Narang

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CertainPerformance · Accepted Answer · 2018-11-09 09:04:01Z

1

You can reduce to push elements which pass the test to the accumulator array in a single iteration over the input:

const data = [
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'McDonalds'}},
  {id:1,especial_id:8,restaurant_items:{id:5,res_name:'Kfc'}},
  {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Sunmeal'}},
   {id:1,especial_id:6,restaurant_items:{id:5,res_name:'Kfc'}},
];
console.log(
  data.reduce((a, { especial_id, restaurant_items: { res_name }}) => {
    if (res_name === 'Kfc') a.push(especial_id)
    return a;
  }, [])
);

answered Nov 9, 2018 at 9:04

CertainPerformance

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Nikhil Aggarwal · Accepted Answer · 2018-11-09 09:04:10Z

1

Use Array.reduce

const data = [{id:1,especial_id:6,restaurant_items:{id:5,res_name:'McDonalds'}},{id:1,especial_id:8,restaurant_items:{id:5,res_name:'Kfc'}},{id:1,especial_id:6,restaurant_items:{id:5,res_name:'Sunmeal'}},{id:1,especial_id:6,restaurant_items:{id:5,res_name:'Kfc'}}];

let result = data.reduce((a,c) => {
  if(c.restaurant_items.res_name === 'Kfc') a.push(c.especial_id);
  return a;
},[]);

console.log(result);

answered Nov 9, 2018 at 9:04

Nikhil Aggarwal

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