Increment Object set javascript

Question

I have an object set

var obj = {
 ref01:{
 test:"abc"
},
ref02:{
 test:"xyz"
},
ref03:{
 test:"pqr"
}
}

and I have new object

const test = {
  test:"def"
}

I want to update the object above with increment value of ref Now ref is03 , I want to append like ref04 and increment each time based on existing obj.

var obj = {
 ref01:{
 test:"abc"
},
ref02:{
 test:"xyz"
},
ref03:{
 test:"pqr"
},
ref04:{
 test:"def"
}
}

i tried object.assign but its directly passing the value . obj = object.assign(obj,{ref:test})

So how can i get it ?

It is bad practice to have properties with a sequential number as suffix. Don't do this. Arrays were invented for this purpose. — trincot
– trincot, Commented Jun 9, 2022 at 14:24
Why you don't simply store your data in an array? obj = [{ref: 'abc'}, {ref: 'def'}] So you can use obj.push({ref: 'ghi'}) — Yukulélé
– Yukulélé, Commented Jun 9, 2022 at 14:26
i want the ref as increment since comes from Api , i need to add new ref incremented and send it back @Yukulélé — 007DevilsWorkshop
– 007DevilsWorkshop, Commented Jun 9, 2022 at 14:35

bturner1273 · Accepted Answer · 2022-06-09 15:03:18Z

3

I think you want a list: i.e.

const obj = {
    testObjects: [
        {
            test: 'abc'
        },
        ...
    ]
}

then you can just run:

obj.testObjects.push({test: 'xyz'});

OR if this is an API response you can't change the schema of:

//find last index so you can add the ref obj
const getFormattedIndex = (idx) => String(idx).padStart(2, '0');
let i = 1;
while(obj[`ref${getFormattedIndex(i)}`]) {
   i++;
}
//add object with the correct sequential key
obj[`ref${getFormattedIndex(i)}`] = {test: 'xyz'};

or you could be a bad person and use scope-bleed with a ghetto for loop 😇:

//find last index so you can add the ref obj
const getFormattedIndex = (idx) => String(idx).padStart(2, '0');
for (var i = 1; obj[`ref${getFormattedIndex(i)}`]; i++);
//add object with the correct sequential key
obj[`ref${getFormattedIndex(i)}`] = {test: 'xyz'};

edited Jun 9, 2022 at 15:03

answered Jun 9, 2022 at 14:26

bturner1273

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3 Comments

007DevilsWorkshop Over a year ago

How does this run ? @bturner1273

bturner1273 Over a year ago

here I'll edit because I see it is an api response now that I assume you can't change

007DevilsWorkshop Over a year ago

Yes, i need to append into existing object set with new ref increment.

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