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
}]

Answer 1

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')) 

Answer 2

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);

Answer 3

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) 

Answer 4

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)) }); 

Answer 5

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

Try this

Answer 6

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
 }, {})