CODEWITHSUNDEEP
javascriptecmascript-6
nwerigbxb
nwerigbxb

Reputation: 51

Creating an array by nested map with filtering

  const market = [
    {
      id: 0,
      properties: [{ name: 'salad', price: 99, isMain: true }],
      value: "1"
    },
    {
      id: 1,
      properties: [{ name: 'patato', price: 100, isMain: false }],
      value: "2"
    },
    {
      id: 2,
      properties: [{ name: 'strawberry', price: 101, isMain: true }],
      value: "3"
    },
  ];

I have data like above, I want to make list of properties which has isMain property is true like the example below. How can I best do this with ES6?

expectation ==>

  [
    {
      name: 'salad',
      price: 99,
      isMain: true,
    },
    {
      name: 'strawberry',
      price: 101,
      isMain: true,
    },
  ];

Upvotes: 0

Views: 235

Answers (3)

Vijay Kumawat
Vijay Kumawat

Reputation: 963

You need to flat the array and then use the filter method to get your desired items from nested array, this will work even if you have multiple items in properties array.

var filtredItems = [];
const market = [
    {
        id: 0,
        properties: [{ name: 'salad', price: 99, isMain: true }],
        value: "1"
    },
    {
        id: 1,
        properties: [{ name: 'patato', price: 100, isMain: false }, { name: 'second', price: 100, isMain: true }],
        value: "2"
    },
    {
         id: 2,
         properties: [{ name: 'strawberry', price: 101, isMain: true }],
         value: "3"
    },
];
filtredItems = market.flatMap(x => x.properties).filter(prop=> prop.isMain);

console.log('filtredItems', filtredItems)

Upvotes: 2

Zouari Khalil
Zouari Khalil

Reputation: 31

you can bind filter with map to get somthing like this i don't know if you have multiple values in properties field:

market.filter(m => m.properties?.[0].isMain)
    .map( m => ({ name: m.name, price: m.properties?.[0].isMain, isMain: m.properties?.[0].isMain  }))

Upvotes: 0

h0ly
h0ly

Reputation: 161

Use ES6 map then filter

  const market = [
    {
      id: 0,
      properties: [{ name: 'salad', price: 99, isMain: true }],
      value: "1"
    },
    {
      id: 1,
      properties: [{ name: 'patato', price: 100, isMain: false }],
      value: "2"
    },
    {
      id: 2,
      properties: [{ name: 'strawberry', price: 101, isMain: true }],
      value: "3"
    },
  ];
  
  const results = market.map(product => product.properties[0]).filter(p => !!p.isMain);
  
  console.log(results);

NB: it is quite weird to have a single hash in an array.

Upvotes: 2

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