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));remove duplicates in array object javascript
//check one attribute
let person = [{name: "john"}, {name: "jane"}, {name: "imelda"}, {name: "john"}];
person = person.filter((item, index, self) =>
index === self.findIndex((t) => (
t.name === item.name
))
)
//check two attributes
let person = [{place: "uno", name: "john"}, {place: "duno", name: "jane"}, {place: "duno" ,name: "imelda"}, {place: "uno" ,name: "john"}];
person = person.filter((item, index, self) =>
index === self.findIndex((t) => (
t.place === item.place && t.name === item.name
))
)remove duplicates objects from array javascript
arr.reduce((acc, current) => {
const x = acc.find(item => item.id === current.id);
if (!x) {
return acc.concat([current]);
} else {
return acc;
}
}, []);how to remove duplicate array object in javascript
var arrayWithDuplicates = [
{"type":"LICENSE", "licenseNum": "12345", state:"NV"},
{"type":"LICENSE", "licenseNum": "A7846", state:"CA"},
{"type":"LICENSE", "licenseNum": "12345", state:"OR"},
{"type":"LICENSE", "licenseNum": "10849", state:"CA"},
{"type":"LICENSE", "licenseNum": "B7037", state:"WA"},
{"type":"LICENSE", "licenseNum": "12345", state:"NM"}
];
function removeDuplicates(originalArray, prop) {
var newArray = [];
var lookupObject = {};
for(var i in originalArray) {
lookupObject[originalArray[i][prop]] = originalArray[i];
}
for(i in lookupObject) {
newArray.push(lookupObject[i]);
}
return newArray;
}
var uniqueArray = removeDuplicates(arrayWithDuplicates, "licenseNum");
console.log("uniqueArray is: " + JSON.stringify(uniqueArray));Removing duplicates in an Array of Objects
// BEST ANSWER - LINEAR TIME SOLUTION
const seen = new Set();
const arr = [
{ id: 1, name: "test1" },
{ id: 2, name: "test2" },
{ id: 2, name: "test3" },
{ id: 3, name: "test4" },
{ id: 4, name: "test5" },
{ id: 5, name: "test6" },
{ id: 5, name: "test7" },
{ id: 6, name: "test8" }
];
const filteredArr = arr.filter(el => {
const duplicate = seen.has(el.id);
seen.add(el.id);
return !duplicate;
});remove duplicates from array of objects javascript
arr.filter((v,i,a)=>a.findIndex(t=>(t.place === v.place && t.name===v.name))===i)Copyright © 2021 Codeinu
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