I would like to convert my array of array of objects to array of objects.
I would like to merge two data into one. I have a data holder which is an array
const dataholder = ["itemCode","item","cashier"];
and a data that needs to map in dataholder
key
const record = [
{
itemCode: { value: 1},
item: { value: 'Pen'},
cashier: {value: 'Sam'}
},
[
itemCode: {value: 2},
item: {value: 'Eraser'},
cashier: {value: 'Kim'}
]
];
I have tried this code below but it the result turns to array of array of array
record?.map( item => {
return dataholder ?.map( (field) => {
return {
[field]: item[field]?.value
}
})
})
and here's the output
[
[
{'itemCode': 1},
{'item': 'Pen'},
{'cashier': 'Sam'}
],
[
{'itemCode': 2},
{'item': 'Eraser'},
{'cashier': 'Kim'}
]
]
expected result
[
{
itemCode: 1,
item: 'Pen',
cashier: 'Sam'
},
{
itemCode: 2,
item: 'Eraser',
cashier: 'Kim'
}
]
Thanks for the help in advance!
Try this:
record?.map(item => {
const obj = {}
for (const key in item)
if (dataholder.includes(key))
obj[key] = item[key].value
return obj
})
You can .map() over your record
objects, and for each object, map over your dataholder
array to create an array of [key, obj[key].value]
arrays. This will result in your inner .map()
creating an array of the form...
[[key, value], [key2, value2], ...]
... for each object ( obj
) that is iterated on by your outer .map()
, where the value is obtained from the obj
. You can then use Object.fromEntries()
to convert this array of key-value pair entries into an object:
const dataholder = ["itemCode","item","cashier"]; const record = [ { itemCode: { value: 1}, item: { value: 'Pen'}, cashier: {value: 'Sam'} }, { itemCode: {value: 2}, item: {value: 'Eraser'}, cashier: {value: 'Kim'} } ]; const res = record.map(obj => Object.fromEntries( dataholder.map(key => [key, obj[key].value]) )); console.log(res);
Instead, in the inner loop, you could use reduce
const res = record.map((item) => {
return dataholder.reduce((acc, field) => {
return {
...acc,
[field]: item[field].value,
};
}, {});
});
const dataholder = ["itemCode", "item", "cashier"]; const record = [ { itemCode: { value: 1 }, item: { value: "Pen" }, cashier: { value: "Sam" }, }, { itemCode: { value: 2 }, item: { value: "Eraser" }, cashier: { value: "Kim" }, }, ]; const res = record.map((item) => { return dataholder.reduce((acc, field) => { return {...acc, [field]: item[field].value, }; }, {}); }); console.log(res);
You can try this way (using .map
combines with for... of
)
var result = record.map(r => {
var item = {};
for(let key of dataholder) item[key] = r[key].value;
return item;
});
var dataholder = ["itemCode","item","cashier"]; var record = [ { itemCode: { value: 1}, item: { value: 'Pen'}, cashier: {value: 'Sam'} }, { itemCode: {value: 2}, item: {value: 'Eraser'}, cashier: {value: 'Kim'} } ]; var result = record.map(r => { var item = {}; for(let key of dataholder) item[key] = r[key].value; return item; }); console.log(result);
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