Convert array in objects to individual strings

Question

How can I split an array of images among an object?

For example, using the JSON below. How can produce a return string of each itemUrl and it's associated productCode?

This JSON

{
  "products": [
    {
      "productCode": "ID1",
      "images": [
        {
          "id": 1,
          "itemUrl": "https://img.com/1.JPG"
        },
        {
          "id": 2,
          "itemUrl": "https://img.com/2.JPG"
        }
      ]
    },
    {
      "productCode": "ID2",
      "images": [
        {
          "id": 3,
          "itemUrl": "https://img.com/3.JPG"
        },
        {
          "id": 4,
          "itemUrl": "https://img.com/4.JPG"
        },
        {
          "id": 5,
          "itemUrl": "https://img.com/5.JPG"
        }
      ]
    }
  ]
}

Becomes

https://img.com/1.JPG
https://img.com/2.JPG
https://img.com/3.JPG
https://img.com/4.JPG
https://img.com/5.JPG

Currently, if I were to use

for (const tour of data.products) {
  console.log(tour.images[0].itemUrl);
  ...

the return would obviously return

https://img.com/1.JPG
https://img.com/3.JPG

however, when

let imageEach = tour.images;
let output = [];
imageEach.forEach(item => {
  output.push(item.itemUrl);
});
  ...

I get a return of

[{
  https://img.com/1.JPG,
  https://img.com/2.JPG
}]

[{
  https://img.com/3.JPG
  https://img.com/4.JPG
  https://img.com/5.JPG
}]

Akrion · Accepted Answer · 2018-12-03 04:53:50Z

6

You can try something like this using Array.reduce to iterate over the products and Array.map to go through the items and get the itemUrl:

const data = { "products": [ { "productCode": "ID1", "images": [ { "id": 1, "itemUrl": "https://img.com/1.JPG" }, { "id": 2, "itemUrl": "https://img.com/2.JPG" } ] }, { "productCode": "ID2", "images": [ { "id": 3, "itemUrl": "https://img.com/3.JPG" }, { "id": 4, "itemUrl": "https://img.com/4.JPG" }, { "id": 5, "itemUrl": "https://img.com/5.JPG" } ] } ] } 

const result = data.products.reduce((r,{images}) => {
  r.push(...images.map(x => x.itemUrl))
  return r
}, [])
 console.log(result.join('\n'))

Or even shorter as suggested by @Prassana by using ES6 array spread some more:

const data = { "products": [ { "productCode": "ID1", "images": [ { "id": 1, "itemUrl": "https://img.com/1.JPG" }, { "id": 2, "itemUrl": "https://img.com/2.JPG" } ] }, { "productCode": "ID2", "images": [ { "id": 3, "itemUrl": "https://img.com/3.JPG" }, { "id": 4, "itemUrl": "https://img.com/4.JPG" }, { "id": 5, "itemUrl": "https://img.com/5.JPG" } ] } ] } 

const result = data.products.reduce((r,{images}) => 
  [...r, ...images.map(x => x.itemUrl)], [])

console.log(result.join('\n'))

edited Dec 3, 2018 at 4:53

answered Dec 3, 2018 at 4:28

Akrion

18.6k1 gold badge38 silver badges58 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Prasanna Over a year ago

since you have already used rest operators what is the point of push here ? you can simple return [...r, ...images.map(x => x.itemUrl) ]

Akrion Over a year ago

Very good point. No reason other than hobbit and trying to type quick :). Will update. Thanks.

Darren Over a year ago

Thank you very much but this still returns as an array rather than individual strings. Reading back at my question, it perhaps is not the clearest.

Akrion Over a year ago

I mean you can join and have it as string etc. See updated answer. You can also simply spread the array console.log(...result)

Darren Over a year ago

Thank you. It does what I asked for, unlikely to work in my issue but I should have been more detailed in my questioning. Thanks again.

holydragon · Accepted Answer · 2018-12-03 04:31:16Z

0

Try

var result = [];
for (var i = 0; i < data.products.length; i++) {
    for (var j = 0; j < data.products[i].images.length; j++){
        result.push(data.products[i].images[j].itemUrl);
    }
}
console.log(result);

answered Dec 3, 2018 at 4:31

holydragon

6,7687 gold badges48 silver badges76 bronze badges

Comments

Prasanna · Accepted Answer · 2018-12-03 04:32:27Z

You need Array.concat

const data = {
  "products": [
    {
      "productCode": "ID1",
      "images": [
        {
          "id": 1,
          "itemUrl": "https://img.com/1.JPG"
        },
        {
          "id": 2,
          "itemUrl": "https://img.com/2.JPG"
        }
      ]
    },
    {
      "productCode": "ID2",
      "images": [
        {
          "id": 3,
          "itemUrl": "https://img.com/3.JPG"
        },
        {
          "id": 4,
          "itemUrl": "https://img.com/4.JPG"
        },
        {
          "id": 5,
          "itemUrl": "https://img.com/5.JPG"
        }
      ]
    }
  ]
}

let urls =  []
data.products.forEach(item => {
  urls = urls.concat(item.images.map(img => img.itemUrl))
})

console.log(urls)

eag845 · Accepted Answer · 2018-12-03 04:38:52Z

You could try this.

let json = {
  "products": [
    {
      "productCode": "ID1",
      "images": [
        {
          "id": 1,
          "itemUrl": "https://img.com/1.JPG"
        },
        {
          "id": 2,
          "itemUrl": "https://img.com/2.JPG"
        }
      ]
    },
    {
      "productCode": "ID2",
      "images": [
        {
          "id": 3,
          "itemUrl": "https://img.com/3.JPG"
        },
        {
          "id": 4,
          "itemUrl": "https://img.com/4.JPG"
        },
        {
          "id": 5,
          "itemUrl": "https://img.com/5.JPG"
        }
      ]
    }
  ]
}
json.products.forEach(product => {
     console.log(product.productCode + ": ")
     product.images.forEach(i => console.log(i.itemUrl))                       
});

// or 
json.products.forEach(product => {
     product.images.forEach(i => console.log(product.productCode + " : " + i.itemUrl))  
});

Son Tr. · Accepted Answer · 2018-12-03 04:39:50Z

0

products.reduce((urls, product, i) => {
  const imageURLs = product.images.map(img => img.itemUrl);
  urls = urls.concat(imageURLs);
  return urls;
}, []);

Try this

answered Dec 3, 2018 at 4:39

Son Tr.

8661 gold badge7 silver badges20 bronze badges

Comments

Akki geek · Accepted Answer · 2018-12-03 05:57:17Z

0

You can try my code to produce following result

{
 "ID1" : ["https://img.com/1.JPG","https://img.com/2.JPG"],
 "ID2" : ["https://img.com/3.JPG","https://img.com/4.JPG","https://img.com/5.JPG"]
}

Below is the code. Lets take your mentioned JSON data as "obj"(a variable)

 obj.products.reduce((acc, product)=>{
   acc[product.productcode] = product.images.map(img => img.itemUrl)
   return acc
 }, {})

edited Dec 3, 2018 at 5:57

answered Dec 3, 2018 at 5:51

Akki geek

716 bronze badges

Collectives™ on Stack Overflow

Convert array in objects to individual strings

6 Answers 6

5 Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

5 Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related