2

This is my array data :

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

I want to add an static empty array inside of this data,

It is possible to insert the empty arry into another array using the map function?

my expected result is :

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

Give any solution or idea for me.

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5 Answers 5

Reset to default
2

Just use forEach:

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

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1 Comment

where is map used as it is mentioned in question.
1 

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

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Comments

1

With Array#map without mutating the original array.

This proposal uses Object.assign and builds a new object with the wanted new 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; }

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1 Comment

without mutating the original array. Good point!!, might be worth mentioning though that Object.assign, is not a deep copy.. Fine for flat objects like this though.
1

You can achieve that just with index like the following: 

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

With map() as you 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);

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Comments

0

Using underscore map you can do that easily 

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

To test visit to underscore open inspect and paste the code to see the result

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