store = [{
"item": "shirt",
"price": 20
},
{
"item": "shirt",
"price": 50
},
{
"item": "pants",
"price": 10
},
{
"item": "pants",
"price": 20
}
]
//im filtering the array to get objects without duplication here
console.log(store.filter((v, i, a) => a.findIndex(v2 => ['item'].every(k => v2[k] === v[k])) === i))and i would like to get the max price as well in the same filter so how would i get this output after excuting it ?
expected output:
[{
"item": "shirt",
"price": 50
},
{
"item": "pants",
"price": 20
}]
You could sort() them by price before filtering.
store = [{
"item": "shirt",
"price": 20
},
{
"item": "shirt",
"price": 50
},
{
"item": "pants",
"price": 10
},
{
"item": "pants",
"price": 20
}
]
const result = store.sort((a, b) => b.price - a.price).filter((v, i, a) => a.findIndex(v2 => ['item'].every(k => v2[k] === v[k])) === i);
console.log(result);I like @axtck's answer. .... Having filtered the objects, now use .map() to find from the original data the max price by sorting:
.map(
({item,price}) =>
({item,price:store.filter(p => p.item === item).sort((a,b) => b.price - a.price)[0].price})
)
store = [{
"item": "shirt",
"price": 20
},
{
"item": "shirt",
"price": 50
},
{
"item": "pants",
"price": 10
},
{
"item": "pants",
"price": 20
}
]
//im filtering the array to get objects without duplication here
console.log(
store.filter((v, i, a) => a.findIndex(v2 => ['item'].every(k => v2[k] === v[k])) === i)
.map(
({item,price}) =>
({item,price:store.filter(p => p.item === item).sort((a,b) => b.price - a.price)[0].price})
)
)You could use Array.reduce() to get the highest price for each item.
We'd enumerate through each value, creating a map object, and if no entry exists for that item or the existing entry has a lower price, we'd update:
const store = [{ "item": "shirt", "price": 20 }, { "item": "shirt", "price": 50 }, { "item": "pants", "price": 10 }, { "item": "pants", "price": 20 } ]
const result = Object.values(store.reduce((acc, { item, price }) => {
// Either item does not exist or has a lower price...
if (!acc[item] || acc[item].price < price) {
acc[item] = { item, price };
}
return acc;
}, {}))
console.log(result).as-console-wrapper { max-height: 100% !important; }