array of strings into array of objects with one attribute each?

Question

How can I turn the below array

['12345', '83747']

into the below array of objects

[ {'id': '12345'}, {'id': '83747'} ]

using map?

My attempt so far, iDs is an empty array, chunk is an array of string.:

obj.iDs.concat(
            chunk.map((item) => ({
                id: item,
            })),
        );

An example, my IDE reports no issues with this code:


const body = [{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'},{'id':'1234'}]

const batchGetRequestObj = {
        ids: [],
        targetProperties: ['contentID, updateDateTime'],
    };

function func() {
        try {
        chunkArray(
            body.map((item) => {
                return item.id;
            }),
            25,
        ).forEach((chunk) => {
            batchGetRequestObj.ids.concat(
                chunk.map((item) => ({
                    ids: item,
                })),
            );
            console.log(batchGetRequestObj);
        });
    } catch (e) {
        console.log(e);
    }
}

function chunkArray(array: string[], size: number) {
    const slicedArray = [];
    for (let i = 0; i < array.length; i += size) {
        slicedArray.push(array.slice(i, i + size));
    }
    return slicedArray;
}

Link to typescript playground

What have you tried so far?

evolutionxbox
– evolutionxbox

2021-05-02 21:57:37 +00:00
Commented May 2, 2021 at 21:57 — evolutionxbox
– evolutionxbox, Commented May 2, 2021 at 21:57
updated with what i have so far

notAChance
– notAChance

2021-05-02 21:59:54 +00:00
Commented May 2, 2021 at 21:59 — notAChance
– notAChance, Commented May 2, 2021 at 21:59
Your map is correct? What are you struggling with?

evolutionxbox
– evolutionxbox

2021-05-02 22:00:42 +00:00
Commented May 2, 2021 at 22:00 — evolutionxbox
– evolutionxbox, Commented May 2, 2021 at 22:00
it outputs an empty array

notAChance
– notAChance

2021-05-02 22:00:59 +00:00
Commented May 2, 2021 at 22:00 — notAChance
– notAChance, Commented May 2, 2021 at 22:00
What is chunk then?

evolutionxbox
– evolutionxbox

2021-05-02 22:01:34 +00:00
Commented May 2, 2021 at 22:01 — evolutionxbox
– evolutionxbox, Commented May 2, 2021 at 22:01

Kinglish · Accepted Answer · 2021-05-02 22:10:31Z

1

You're using concat, which doesn't mutate the arrays - you'll have to set the values back to the variable

   var arr = ['12345', '83747']
   var newids = obj.ids.concat(arr.map( str => { return {"id" : str}});
   obj.ids = newids

edited May 2, 2021 at 22:10

answered May 2, 2021 at 21:59

Kinglish

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6 Comments

Kinglish Over a year ago

Thx. OP didn't have that code at the time. But I updated my answer for concat

evolutionxbox Over a year ago

They hadn't. (this is why I wait until someone shows an example of their effort before answering)

notAChance Over a year ago

example added above

Kinglish Over a year ago

@notAChance - the same concat issue will happen with your updated code. See my answer above. In your new code batchGetRequestObj.ids = batchGetRequestObj.ids.concat(...

notAChance Over a year ago

@JohnTyner thanks, I without fail ALWAYS forget this.

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