JS creating multi value objects array from an array

Question

Trying to get this ['Team Instinct', 'Team Valor', 'Team Mystic']

To this

[{
    answer: "Team Instinct",
    id: asdfsodijha120-938a //nanoid()
 },
 {
    answer: "Team Valor",
    id: 12390i1-293-12093a2 //nanoid()
 },
 {
    answer: "Team Mystic",
    id: 123908320i09i09ss8a //nanoid()
 }
]

What i tried so far

const { nanoid } = require("nanoid")

const array = ['Team Instinct', 'Team Valor', 'Team Mystic']
let object = {}

obcject = array.reduce((prevValue,currentValue) => {
    prevValue.push({
        answer: currentValue,
        id: nanoid()
    })
},[])

ERROR I GET TypeError: Cannot read properties of undefined (reading 'push')

Does this answer your question? [From an array of objects, extract value of a property as array](https://stackoverflow.com/questions/19590865/from-an-array-of-objects-extract-value-of-a-property-as-array) — Mark Schultheiss, Feb 03 '22 at 20:00

score 3 · Accepted Answer · answered Feb 03 '22 at 19:56

3

You forgot to return prevValue;

 const { nanoid } = require("nanoid")
    
    const array = ['Team Instinct', 'Team Valor', 'Team Mystic']
    let object = {}
    
    obcject = array.reduce((prevValue,currentValue) => {
        prevValue.push({
            answer: currentValue,
            id: nanoid()
        })
        return prevValue
    
    },[])

answered Feb 03 '22 at 19:56

Andrii Svirskyi

376
1
4

1

Works ! thanks Andrii – Eyal Solomon Feb 03 '22 at 21:10

score 3 · Answer 2 · answered Feb 03 '22 at 20:00

3

Orig answer is correct, you're missing the return. However, here's an alternate way of writing it

const { nanoid } = require("nanoid")
let object = ['Team Instinct', 'Team Valor', 'Team Mystic'].reduce((prevValue, currentValue) => ([...prevValue, {
  answer: currentValue,
  id: nanoid()
}]), [])

answered Feb 03 '22 at 20:00

Kinglish

23,358
3
22
43

cool twist.thanks – Eyal Solomon Feb 03 '22 at 21:06

score 1 · Answer 3 · answered Feb 03 '22 at 19:58

When you use a reducer You lust return the value after pushing in it.

So first error, you never return the result in the callback function. The seconde one, is that you trying then to assign the result of the reduce (an array) to an object.

const { nanoid } = require("nanoid");

const array = ['Team Instinct', 'Team Valor', 'Team Mystic'];

const result = array.reduce((prevValue,currentValue) => {
    prevValue.push({
        answer: currentValue,
        id: nanoid()
    });
    return prevValue;
},[]);

JS creating multi value objects array from an array

3 Answers3