Stuck with comparison arrays with objects which has IDs

July 28, 2023

I have 2 arrays with objects

With car brands

const brands = [
   { id: 1, name: "Mercedes Benz", bodyType: [1, 3] },
   { id: 2, name: "Audi", bodyType: [1, 2] },
   { id: 3, name: "BMW", bodyType: [3, 4] },
   { id: 4, name: "Mazda", bodyType: [1, 2, 4] }
];

With body types

const bodyTypes = [
   { id: 1, type: "Sedan"},
   { id: 2, type: "Coupe"},
   { id: 3, type: "Hatchback"},
   { id: 4, type: "SUV"}
];

I have picked types

const pickedTypes = [2, 4] // Coupe & SUV

How to compare this two arrays to get new array with brands that has body types that in pickedTypes

There is my try to get an array that I want

const brands = [
   { id: 1, name: "Mercedes Benz", bodyType: [1, 3] },
   { id: 2, name: "Audi", bodyType: [1, 2] },
   { id: 3, name: "BMW", bodyType: [3, 4] },
   { id: 3, name: "Mazda", bodyType: [1, 2, 4] }
];

const bodyTypes = [
   { id: 1, type: "Sedan"},
   { id: 2, type: "Coupe"},
   { id: 3, type: "Hatchback"},
   { id: 4, type: "SUV"}
];

const pickedTypes = [2, 4] // coupe & suv

let newBrandsByPickedTypes = [];

// loop for every type
for(let i = 0; i < pickedTypes.length; i++){
  // loop for every brand
  for(let k = 0; k < brands.length; k++){
      // loop for every type in brand
      brands[k].bodyType.forEach((type) => {
        // if brand has type that in pickedTypes push this brand to newBrandsByPickedTypes 
        if(type === pickedTypes[i]){
            newBrandsByPickedTypes.push(brands[k])
        }
      })
  }

}

newBrandsByPickedTypes && console.log(newBrandsByPickedTypes); // output audi, mazda, bmw

Im stuck in this many loops actually..

It looks like it’s work but I have something like a warning: [circular object Object]]

>Solution :

You can filter from the brands array based on whether any of the ids in pickedTypes is present in individual brand’s bodyType array. Here is a possible solution

brands.filter(brand => pickedTypes.some(type => brand.bodyType.includes(type))).map(brand => brand.name)

Output

['Audi', 'BMW', 'Mazda']

In this case, since pickedType contains ids already and not names, bodyTypes array is not required, if pickedTypes had "Sedan", "Coupe" etc, you could have mapped the ids from bodyTypes and searched with that array