how to add an json array of object into array of objects?

Question

For the json object :

 var str={  
  "roles":[
            {
                "roleId":"Abcd",
                "envRoleName": "0101",
                "roleName": "Admin",
                "envCode":"HosJ",
                "envName":"UoH"
            },
            {
                "roleId":"efgh",
                "envRoleName": "0102",
                "roldeName": "User",
                "envCode":"HosJ",
                "envName":"HosJ"
            }
        ]
       }

and I have an array const available_roles: Role[] = []

I am trying to insert each object from json array into the Role[] by

var json = JSON.parse(str); numParams = Object.keys(json.roles[0]).length;

for(j = 0 ; j < json.roles.length ; j++){
   if(j % numParams == 0){
      available_roles.push ( json.roles[j] );
   }
 }

The available_roles array is populated with 10 objects instead of just 2 objects. Can someone explain why this might be, please?

Answer 1

Why don't you just assign the object directly?

var json = JSON.parse(str);
for(j = 0 ; j < json.roles.length ; j++) {
  available_roles.push ( json.roles[j] );
}

Answer 2

No need of parse, Just do it directly becoz its already object. JsFiddle

var str={  
  "roles":[
            {
                "roleId":"Abcd",
                "envRoleName": "0101",
                "roleName": "Admin",
                "envCode":"HosJ",
                "envName":"UoH"
            },
            {
                "roleId":"efgh",
                "envRoleName": "0102",
                "roldeName": "User",
                "envCode":"HosJ",
                "envName":"HosJ"
            }
        ]
       }


var availableuser = [];
for(j = 0 ; j < str.roles.length ; j++)
             {

                     console.log(str.roles[j])
                     availableuser.push(str.roles[j]);

             }

             console.log(availableuser);

Answer 3

str is already a JSON object. You can use it directly without parsing:

var numParams = Object.keys(str.roles[0]).length;
for(j = 0 ; j < str.roles.length ; j++)
{
 if(j % numParams == 0){
     available_roles.push ( str.roles[j] );
 }
}

Answer 4

Some observations :

• As str is already a JSON object so no need to parse it again.
• You can push the roles into the available_roles array diectly. no need to do this type of condition j % numParams == 0 .

DEMO

 var str = { "roles": [{ "roleId": "Abcd", "envRoleName": "0101", "roleName": "Admin", "envCode": "HosJ", "envName": "UoH" }, { "roleId": "efgh", "envRoleName": "0102", "roldeName": "User", "envCode": "HosJ", "envName": "HosJ" }] }; var json = str; var available_roles = []; for(j = 0 ; j < json.roles.length ; j++){ available_roles.push(json.roles[j]); } console.log(available_roles);