I want to convert a Java HashMap to a javascript array where the key is inside the javascript object.
I have tried to convert the JSON to a javascript object with an array inside. The Java Map looks like this < string: "sequence", Object: Round>
A quick overview of the objects I want to convert from a Java object (JSON) to javascript array.
export class Order extends Base {
public createdAt: Date;
public status: OrderStatus;
public rounds: Round[];
}
export class Round extends Base {
public lockable: boolean;
public locked: boolean;
public sequence: number;
public createdAt: string;
public orderedItems?: Item[];
}
The JSON I receive from the server:
[
{
"id": "87921b20-232d-4e13-8154-5ecdcdfeea83",
"createdAt": 1556284343924,
"status": "UNPAID",
"rounds": {
"1": {
"id": "ffd791b7-3575-4653-9e65-0d95ed027d37",
"createdAt": 1556284343930,
"lockable": false,
"locked": false,
"orderedItems": []
},
"2": {
"id": "310bbdff-2c41-4e22-96da-46282e158b49",
"createdAt": 1556284343936,
"lockable": true,
"locked": false,
"orderedItems": []
}
}
}
]
Right now the thing I want to do is the following. I thought in javascript the order of a array is not guaranteed so I wanted to add the id inside the object after fetching it from the API.
"2": <-- MOVE SEQUENCE inside the object like:
{
...
"sequence": "2"
}
I couldnt find a other solution like this in javascript, but hopefully you can give me a more proper solution:
order.forEach(o => {
const rounds = [];
Object.keys(o.rounds).forEach(key => {
o.rounds[key].sequence = key;
rounds.push(o.rounds[key]);
});
o.rounds = rounds;
});
The JSON you're receiving doesn't contain an array of Rounds; it contains a map, as you've observed. It would be much cleaner to look at whatever's serialising to this JSON, and correcting it so that the JSON looks like
[
{
...
"rounds": [
{
"id": "ffd791b7-3575-4653-9e65-0d95ed027d37",
"createdAt": 1556284343930,
"lockable": false,
"locked": false,
"orderedItems": []
},
{
"id": "310bbdff-2c41-4e22-96da-46282e158b49",
"createdAt": 1556284343936,
"lockable": true,
"locked": false,
"orderedItems": []
}
]
}
]
However if you really need to, you could do:
var out = []
for(var key in obj) {
out[key] = obj[key]
}
You said: "I thought in javascript the order of a array is not guaranteed". Arrays are definitely ordered in Javascript. You may be thinking of something that's not an array? Therefore I see little value in adding a sequence property to each member of the array.
If you really want to, though, it's simple enough:
var out = [];
for(var key in obj) {
out[key] = m[key]
out[key].sequence = key
}
This does all rely on the keys all being numbers, or coercable to numbers.
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