Want to merge object key values with another object value.
Suppose results object key should match with headers object key_name match because header should be CamelCase. I have headers object is:
let headers = [
{ key_name: 'pid', header_value: 'PID' },
{
key_name: 'card_no',
header_value: 'Card Number'
},
{
key_name: 'trans_id',
header_value: 'Transaction ID'
},
{
key_name: 'card_name',
header_value: 'Card Name'
}
]
results Object is:
let results = let results = [
{
pid: '1234567890',
card_no: '546.......3742',
trans_id: '2019124453159',
card_name: 'Mastercard',
code: '$'
},
{
pid: '1234567890',
card_no: '546.......3742',
trans_id: '2019120534555',
card_name: 'Visa',
code: 'INR'
}
]
Header object key_name matching values need to filter in final results Object like below. expected results is:
let results = [
{
PID: '1234567890',
Card Number: '546.......3742',
Transaction ID: '2019124453159',
Card Name: 'Mastercard'
},
{
PID: '1234567890',
Card Number: '546.......3742',
Transaction ID: '2019120534555',
Card Name: 'Visa'
}
]
I tried with below script its returning all values only:
for (let index = 0; index < results.length; index++) {
for (let i = 0; i < headers.length; i++) {
console.log(results [index][header[i].key_name])
}
}
I would suggest turning the first object into a map, so you have faster look-up. Then turn your objects into key/value pairs with Object.entries, perform the mapping and the filtering, and then turn those pairs back to an object with Object.fromEntries
let headers = [{ key_name: 'pid', header_value: 'PID' },{key_name: 'card_no',header_value: 'Card Number'},{key_name: 'trans_id',header_value: 'Transaction ID'},{key_name: 'card_name',header_value: 'Card Name'}];
// Convert to map:
let map = new Map(headers.map(({key_name, header_value}) => [key_name, header_value]));
let arr = [{pid: '1234567890',card_no: '546.......3742',trans_id: '2019124453159',card_name: 'Mastercard',code: '$'},{pid: '1234567890', card_no: '546.......3742',trans_id: '2019120534555',card_name: 'Visa',code: 'INR'}];
// Use map to make transition
let result = arr.map(obj =>
Object.fromEntries(Object.entries(obj).map(([key, value]) =>
map.has(key) && [map.get(key), value]
).filter(Boolean))
);
console.log(result);You could look into the Object.keys(..) of the results array so you can map the old key values to the new ones.
You could use something like this:
const mappedHeaders = results.map((r) => {
const keys = Object.keys(r);
let newObj = {};
for (const key of keys) {
const newHeader = headers.find((h) => h.key_name === key);
if (newHeader) newObj[newHeader.header_value] = r[key];
}
return newObj;
});
You may need to check if the mapping exists and handle such cases to avoid errors.