come rimuovere l'oggetto array duplicato in javascript
let person = [{name: "john"}, {name: "jane"}, {name: "imelda"}, {name: "john"}];
function removeDuplicates(data, key) {
return [
...new Map(data.map(item => [key(item), item])).values()
]
};
console.log(removeDuplicates(person, item => item.name));
filtro valore duplicato nella matrice di oggetto typescript
var arrOfObj = [
{
id:1 ,name:'abc',age:27
},
{
id:2 ,name:'pqr',age:27
},
{
id:1 ,name:'abc',age:27
},
]
var setObj = new Set(); // create key value pair from array of array
var result = arrOfObj.reduce((acc,item)=>{
if(!setObj.has(item.age)){
setObj.add(item.age)
acc.push(item)
}
return acc;
},[]);//converting back to array from mapobject
console.log(result);
rimuovere duplicato in aaray di oggetti
const things = {
thing: [
{ place: 'here', name: 'stuff' },
{ place: 'there', name: 'morestuff1' },
{ place: 'there', name: 'morestuff2' },
],
};
const removeDuplicates = (array, key) => {
return array.reduce((arr, item) => {
const removed = arr.filter(i => i[key] !== item[key]);
return [...removed, item];
}, []);
};
console.log(removeDuplicates(things.thing, 'place'));
// > [{ place: 'here', name: 'stuff' }, { place: 'there', name: 'morestuff2' }]