0

I have the following array of objects

const sorted = [
{
IsoCode: "EUR",
Buy: 1.948,
Sell: 1.963
},
{
IsoCode: "GBP",
Buy: 2.1184,
Sell: 2.1894
},
{
IsoCode: "USD",
Buy: 1.5781,
Sell: 1.6484
},
]

and I want to create an Object looking like this

 {
 USD: 
 {
 buy:1.5781,
 sell:1.6484,
 
 },
 EUR:
 {
 buy:1.948,
 sell:1.963,
 },
 GBP: 
 {
 buy:2.1184,
 sell:2.1894,
 }
 }

Currently I'am assigning the values manually, but I don't think this is scalable. I'm looking for more effective approach.

asked Dec 8, 2020 at 16:53
2
  • 2
    Have you tried a loop? Please post your current code as well. Commented Dec 8, 2020 at 17:07
  • I suggest you use reduce(). Commented Dec 8, 2020 at 17:09

2 Answers 2

3

I would go for Object.fromEntries and the object rest syntax:

const sorted = [{IsoCode: "EUR",Buy: 1.948,Sell: 1.963},{IsoCode: "GBP",Buy: 2.1184,Sell: 2.1894},{IsoCode: "USD",Buy: 1.5781,Sell: 1.6484},];
let res = Object.fromEntries(sorted.map(({IsoCode, ...rest}) => [IsoCode, rest]));
console.log(res);

answered Dec 8, 2020 at 17:11
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Comments

2

You could use Array.prototype.reduce() like this:

const sorted = [{
 IsoCode: "EUR",
 Buy: 1.948,
 Sell: 1.963
 }, {
 IsoCode: "GBP",
 Buy: 2.1184,
 Sell: 2.1894
 }, {
 IsoCode: "USD",
 Buy: 1.5781,
 Sell: 1.6484
 },
]
const obj = sorted.reduce(
 (acc, { IsoCode, Buy, Sell }) => 
 (acc[IsoCode] = { Buy, Sell }) && acc,
 {}
);
console.log(obj);

answered Dec 8, 2020 at 17:03

5 Comments

What's that IIFE good for? Also arr is not an array.
It's to extract needed properties
But why not just destrucure the cur parameter to the reducer directly? (acc, {IsoCode, Buy, Sell}) => { acc[IsoCode] = {Buy, Sell}; return acc; }
Something like this might be better:sorted.reduce((acc, { IsoCode, ...rest }) => ({ ...acc, [IsoCode]: rest }),{})
It just depends whether OP wants to extract these exact keys or the rest, which is not precised. Also, having a pure function instead of mutating the accumulator is just one's opinion.

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