How to define a string of array with compounded data

Question

Well I know im doing wrong ...

var recipient=[{}];
if (content.moderators.length != 0) {
 for (var i = 0; i < content.moderators.length; i++) {
 console.log(content.moderators[i])
 recipient[i].id=content.moderators[i];
 recipient[i].status="unread";
 }
}

I’m getting an error :

TypeError: Cannot set property 'id' of undefined

What’s the correct way ...

• Fanyo SILIADIN: what exactly are you trying to do?

Answer 1

Define a simple array [] then create object and push it to the array like :

recipient[i]= {'id':content.moderators[i], 'status': 'unread'};

Full code :

var recipient=[];
if (content.moderators.length != 0) {
 for (var i = 0; i < content.moderators.length; i++) {
 recipient[i]= {'id':content.moderators[i], 'status': 'unread'};
 }
}

Hope this helps.

Answer 2

This should get it:

var recipient = [];
if (content.moderators.length != 0) {
 for (var i = 0; i < content.moderators.length; i++) {
 console.log(content.moderators[i])
 recipient.push({
 id: content.moderators[i],
 status: "unread"
 });
 }
}

• CoryG: @pwolaq Probably something the OP is accustomed to doing due to nuances of other languages but I just modified the original code to work. Nit-picking about what is proper when someone is asking a direct question is more of an annoyance than it is useful.

Answer 3

Try it this way. You need to create the object at recipient[id] before assigning id to it. Here, you'll create the object with the properties populated already

var recipient = [];
if (content.moderators.length != 0) {
 for (var i = 0; i < content.moderators.length; i++) {
 recipient[i] = {
 id: content.moderators[i],
 status: "unread"
 }
 }
 }

• vladCovaliov: I just updated his code with the correct expression without questioning the logic behind it :)

Answer 4

You could map the new object with Array#map.

The map() method creates a new array with the results of calling a provided function on every element in this array.

var content = { moderators: ['Hank', 'Jane', 'Ann', 'Bill'] },
 recipient = content.moderators.map(function(m) {
 return { id: m, status: "unread" };
 });
console.log(recipient);

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

ES6

var content = { moderators: ['Hank', 'Jane', 'Ann', 'Bill'] },
 recipient = content.moderators.map(m => ({ id: m, status: "unread" }));
console.log(recipient);

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

Answer 5

if content.moderators is an Array

var recipient = moderators.map(id => ({ id, status: "unread" }))