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 — Mark Schultheiss
– Mark Schultheiss, Commented Feb 3, 2022 at 20:00

Andrii Svirskyi · Accepted Answer · 2022-02-03 19:56:18Z

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 3, 2022 at 19:56

Andrii Svirskyi

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Comments

Kinglish · Accepted Answer · 2022-02-03 20:00:32Z

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 3, 2022 at 20:00

Kinglish

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Comments

Adrien De Peretti · Accepted Answer · 2022-02-03 19:58:49Z

1

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;
},[]);

answered Feb 3, 2022 at 19:58

Adrien De Peretti

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