How can an empty array be added to another array using the map method in JavaScript?

Question

How can an empty array be added to another array using the map method in JavaScript?

Here is the array data I am working with:

var  service: [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];

I am looking to add a static empty array within this data,

Is it possible to insert an empty array into another array using the map function?

My desired output is :

 var service: [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
                all:[]
            }];

Please provide any solutions or ideas you may have. Thank you.

javascript arrays object

Answer 1

Answer №1

Instead of a traditional loop, utilize the forEach method:

let data = [{id: '1', name: 'gana', age: '21', spare: 'rinch'}];
data.forEach(entry => entry.all = []);
console.log(data);

Answer 2

Instead of a traditional loop, utilize the forEach method:

let data = [{id: '1', name: 'gana', age: '21', spare: 'rinch'}];
data.forEach(entry => entry.all = []);
console.log(data);

Answer 3

Answer №2

var newService = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
 console.log(newService);
newService.forEach(item => item.all= []);
console.log(newService);

Answer 4

var newService = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
 console.log(newService);
newService.forEach(item => item.all= []);
console.log(newService);

Answer 5

Answer №3

Utilizing Array#map to create a new array without altering the original.

This approach involves using Object.assign to construct a new object with the desired additional property.

var service = [{ id: '1', name: 'gana', age: '21', spare: 'rinch' }],
    withAll = service.map(o => Object.assign({}, o, { all: [] }));

console.log(withAll);
console.log(service);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 6

Utilizing Array#map to create a new array without altering the original.

This approach involves using Object.assign to construct a new object with the desired additional property.

var service = [{ id: '1', name: 'gana', age: '21', spare: 'rinch' }],
    withAll = service.map(o => Object.assign({}, o, { all: [] }));

console.log(withAll);
console.log(service);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 7

Answer №4

To achieve the desired outcome using index, you can follow this example:

var service = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
service[0].all = [];
console.log(service)

If you prefer using map() as mentioned in the question:

var service = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
service = service.map(function(i){
  i.all=[]; return i;
});
console.log(service);

Answer 8

To achieve the desired outcome using index, you can follow this example:

var service = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
service[0].all = [];
console.log(service)

If you prefer using map() as mentioned in the question:

var service = [{
                id: '1',
                name: 'gana',
                age: '21',
                spare: 'rinch',
            }];
service = service.map(function(i){
  i.all=[]; return i;
});
console.log(service);

Answer 9

Answer №5

One simple way to achieve this is by using the underscore map function.

_.map([{
    id: '1',
    name: 'gana',
    age: '21',
    spare: 'rinch',
}], function(person) { person.all = [];
    return person; });

If you want to test this, you can go to underscore website, open the inspect tool, and paste the code to see the result.

Answer 10

One simple way to achieve this is by using the underscore map function.

_.map([{
    id: '1',
    name: 'gana',
    age: '21',
    spare: 'rinch',
}], function(person) { person.all = [];
    return person; });

If you want to test this, you can go to underscore website, open the inspect tool, and paste the code to see the result.

How can an empty array be added to another array using the map method in JavaScript?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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