filter to remove duplicate objects from array javascript code example
Example 1: how to remove duplicate array object 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));
Example 2: remove duplicate in aaray of objects
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'));