CODEWITHSUNDEEP
arraysjsonangulartypescript
Venkat B
Venkat B

Reputation: 41

how to push object into jsonArray in typescript?

I am trying to pushing object into existing json data in typescript, i am new to typescript, i created array variable in typescript let jsonArrayObject: boolean[] = [];and this jsonArrayObject contains contactModel object, in this object contain properties like fname,lname, id,mobile. bellow i tried code. please help me.

let jsonArrayObject: boolean[] = [];

jsonArrayObject=[{
    contactModel:{
    fname:"vboyini",
    lname:"simha",
    id:"1",
    Mobile:"99768999"
    }
}];
var modelData :String={
 fname:"vboyini2",
lname:"simha2",
id:"2",
Mobile:"799768999"
}

now i want unshift arrayitem that is contactModel object into jsonArrayObject. i tried bellow following code.

this.jsonArrayObject.unshift({"contactModel":any=modelData})

above code is not working. how can i push?please help me any one

Upvotes: 2

Views: 26453

Answers (5)

Naruto
Naruto

Reputation: 1

let jsonArrayObject=[];
let demo={};
demo={

    id:1,
    "name":"John Doe"
}
jsonArrayObject.push(demo);

Upvotes: 0

Vayrex
Vayrex

Reputation: 1467

Your scripts are showing compilation error. Cut type of array values are set to Boolean.

let jsonArrayObject: boolean[] = [];

You need to set it to right format.

interface IContactModelData{
  fname:string;
  lname:string;
  id:string;
  Mobile:string;  
}

interface IContactModel{
  contactModel: IContactModelData   
}

let jsonArrayObject: IContactModel[] = [];

jsonArrayObject=[{
  contactModel:{
    fname:"vboyini",
    lname:"simha",
    id:"1",
    Mobile:"99768999"
  }
}];

var modelData:IContactModelData = {
  fname:"vboyini2",
  lname:"simha2",
  id:"2",
  Mobile:"799768999"
};

jsonArrayObject.push({contactModel:modelData});

Upvotes: 1

Saso
Saso

Reputation: 148

First of all - you doing it all wrong.

Declare it like this:

    let jsonArrayObject = [];
    jsonArrayObject = [
        {
            fname: 'vboyini',
            lname: 'simha',
            id: '1',
            Mobile: '99768999'
        }
    ];
    let modelData = {
        fname: 'vboyini2',
        lname: 'simha2',
        id: '2',
        Mobile: '799768999'
    };

Then you can push modelData in the Array like this, or you can unshift, slice, splice and do whatever you want with the Array

jsonArrayObject.push(modelData);

Upvotes: 2

Sarasa Gunawardhana
Sarasa Gunawardhana

Reputation: 1119

If you need to push object into array , no need to declare it as a boolean.

let jsonArrayObject = [];

jsonArrayObject.push({
  fname:"vboyini2",
  lname:"simha2",
  id:"2",
  Mobile:"799768999"
});

Upvotes: 4

Naman Kheterpal
Naman Kheterpal

Reputation: 1840

You don't need to put type in object while unshifting

simply do:

this.jsonArrayObject.unshift({"contactModel":modelData});

where modelData is a variable.

Upvotes: 0

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