if I have an array of strings like:
['person,item,cost,amount',
'John,shoes,200,2']
how could I convert this into an object that resembles:
{
'John':[
{
item:'shoes',
cost:'200',
amount:'2',
totalPriceForItems:'400'
}
CodePudding user response:
If I understand correctly, you may try something like this:
const convert = data => {
const [columnsText, ...items] = data;
const columns = columnsText.split(',');
return items.reduce((acc, text) => {
const { person, ...entries } = Object.fromEntries(text.split(',').map((value, i) => [columns[i], value]));
entries.totalPriceForItems = String(entries.cost * entries.amount);
if(acc[person]) {
acc[person].push(entries);
} else {
acc[person] = [entries];
}
return acc;
}, {});
};
const result = convert([
'person,item,cost,amount',
'John,shoes,200,2',
'Bob,glasses,50,3',
'John,shirts,100,5',
]);
console.log(result);
CodePudding user response:
According to your comment,
I have 8 lines of 'John,shoes,200,2' but with different amounts in the same array. The 'person,item,cost,amount' is only mentioned once at the start of the array
What I understand is that you have a csv with headers and multiple rows. If that is the case, then your data would resemble something like this:
data = [
'person,item,cost,amount',
'John,shoes,200,2',
'Adam,pants,60,1',
'Kelly,skirt,180,2',
'John,skirt,150,3'
]
Then you could consider the following approach, that is generic enough to adapt to different headers, and multiple data rows with repeated keys (person names).
// here, you define a function to transform each row of your data,
// like parsing numeric attributes and calculating the totals
function transform(row) {
row.cost = Number.parseInt(row.cost)
row.amount = Number.parseInt(row.amount)
row.total = row.cost * row.amount
return row
}
// The following logic is generic, and can be used
// to map and aggregate any kind of csv with headers
hdrs = data.shift().split(',').slice(1)
rows = data.map(r => r.split(',')).reduce((acc, [n, ...kvs]) =>
({ ...acc, [n]: [...acc[n] || [], transform(Object.fromEntries(kvs.map((v, i) => [hdrs[i], v])))] }), {})
Output:
{
John: [
{ item: "shoes", cost: 200, amount: 2, total: 400 },
{ item: "skirt", cost: 150, amount: 3, total: 450 }],
Adam: [
{ item: "pants", cost: 60, amount: 1, total: 60 }],
Kelly: [
{ item: "skirt", cost: 180, amount: 2, total: 360 }]
}