Tips for retrieving the corresponding second array of objects in ES6

Question

Tips for retrieving the corresponding second array of objects in ES6

I am working with two arrays of objects and need to find a better solution.

array1= [{id:1,name:"samsung"},{id:2,name:"nokia"},{id:3,name:"Lg"}];
array2 = [{id:5,name:"samsung"},{id:2,name:"panasonics"},{id:7,name:"Lg"}];

The expected output should be: When the id from the first array matches the id from the second array, we want to use the name from the second array. In this case, since id 2 matches, the desired result is id:2,name: panasonics.

Output:

 [{id:1,name:"samsung"},{id:2,name:"panasonics"},{id:3,name:"Lg"},{id:5,name:"samsung"},{id:7,name:"Apple"}]

javascript typescript ecmascript-6 es6-promise ecmascript-5

Answer 1

Answer №1

Merge the arrays by using Array.concat(), transform them into a Map based on the id field, and then convert the values of the Map into an array using Array.from():

const mergeArraysByField = (field, ...arrays) => Array.from(
  [].concat(...arrays)
  .reduce((result, object) => result.set(object.id, object), new Map)
  .values()
);

const firstArray = [{id:1,name:"samsung"},{id:2,name:"nokia"},{id:3,name:"Lg"}];
const secondArray = [{id:5,name:"samsung"},{id:2,name:"panasonics"},{id:7,name:"Lg"}];

const mergedResult = mergeArraysByField('id', firstArray, secondArray);

console.log(mergedResult);

Answer 2

Merge the arrays by using Array.concat(), transform them into a Map based on the id field, and then convert the values of the Map into an array using Array.from():

const mergeArraysByField = (field, ...arrays) => Array.from(
  [].concat(...arrays)
  .reduce((result, object) => result.set(object.id, object), new Map)
  .values()
);

const firstArray = [{id:1,name:"samsung"},{id:2,name:"nokia"},{id:3,name:"Lg"}];
const secondArray = [{id:5,name:"samsung"},{id:2,name:"panasonics"},{id:7,name:"Lg"}];

const mergedResult = mergeArraysByField('id', firstArray, secondArray);

console.log(mergedResult);

Answer 3

Answer №2

If you're looking to compare arrays and extract matching elements based on a specific condition, one way to do it is by utilizing the .forEach() loop as demonstrated below (alternatively, you could use a traditional for loop, but the .forEach() method offers simplicity).

The following code snippet iterates through items in array1 and within that iteration, it scans through each item in array2. It then verifies if the IDs match between the two arrays; if they do, the corresponding name is added to the result array.

const array1= [{id:1,name:"samsung"},{id:2,name:"nokia"},{id:3,name:"Lg"}];
const array2 = [{id:5,name:"samsung"},{id:2,name:"panasonics"},{id:7,name:"Lg"}];
let result = [];

array1.forEach(e1 => {
  array2.forEach(e2 => {
    if (e1.id == e2.id) {
      result.push(e2.name);
    }
  });
});

console.log(result);

Answer 4

If you're looking to compare arrays and extract matching elements based on a specific condition, one way to do it is by utilizing the .forEach() loop as demonstrated below (alternatively, you could use a traditional for loop, but the .forEach() method offers simplicity).

The following code snippet iterates through items in array1 and within that iteration, it scans through each item in array2. It then verifies if the IDs match between the two arrays; if they do, the corresponding name is added to the result array.

const array1= [{id:1,name:"samsung"},{id:2,name:"nokia"},{id:3,name:"Lg"}];
const array2 = [{id:5,name:"samsung"},{id:2,name:"panasonics"},{id:7,name:"Lg"}];
let result = [];

array1.forEach(e1 => {
  array2.forEach(e2 => {
    if (e1.id == e2.id) {
      result.push(e2.name);
    }
  });
});

console.log(result);

Answer 5

Answer №3

To achieve the desired result, you can utilize the map() and concat() functions in the code snippet below:

let array1 = [{id: 1, name: "Samsung"}, {id: 2, name: "Nokia"}, {id: 3, name: "LG"}];
let array2 = [{id: 5, name: "Samsung"}, {id: 2, name: "Panasonics"}, {id: 7, name: "LG"}];
let newArray = array1.map(function(item, index){
    if(array2[index].id === item.id){
        return array2[index];
    } else {
        return item;
    }
});
let finalArray = newArray.concat(array2);
console.log(finalArray);

Answer 6

To achieve the desired result, you can utilize the map() and concat() functions in the code snippet below:

let array1 = [{id: 1, name: "Samsung"}, {id: 2, name: "Nokia"}, {id: 3, name: "LG"}];
let array2 = [{id: 5, name: "Samsung"}, {id: 2, name: "Panasonics"}, {id: 7, name: "LG"}];
let newArray = array1.map(function(item, index){
    if(array2[index].id === item.id){
        return array2[index];
    } else {
        return item;
    }
});
let finalArray = newArray.concat(array2);
console.log(finalArray);

Tips for retrieving the corresponding second array of objects in ES6

Answer №1

Answer №2

Answer №3

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