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how to remove duplicate array object in javascript
const arr = [ { id : 1 , name : 'one' } , { id : 2 , name : 'two' } , { id : 1 , name : 'one' } ]
const ids = arr. map ( o => o. id )
const filtered = arr. filter ( ( { id} , index) => ! ids. includes ( id, index + 1 ) )
console . log ( filtered)
remove duplicate objects from array javascript
const addresses = [ ... ] ;
const uniqueAddresses = Array . from ( new Set ( addresses. map ( a => a. id ) ) )
. map ( id => {
return addresses. find ( a => a. id === id)
} )
how to remove duplicate array object in javascript
let person = [
{ name : "john" } ,
{ name : "jane" } ,
{ name : "imelda" } ,
{ name : "john" } ,
{ name : "jane" }
] ;
const data = Array . from ( new Set ( person. map ( JSON . stringify ) ) ) . map ( JSON . parse ) ;
console . log ( data) ;
how to remove duplicate array object in javascript
let person = [
{ name : "john" } ,
{ name : "jane" } ,
{ name : "imelda" } ,
{ name : "john" } ,
{ name : "jane" }
] ;
const obj = [ ... new Map ( person. map ( item => [ JSON . stringify ( item) , item] ) ) . values ( ) ] ;
console . log ( obj) ;
remove duplicates from array of objects javascript
let arr = [ { name : "john" } , { name : "jane" } , { name : "imelda" } , { name : "john" } ] ;
const uniqueArray = arr. filter ( ( v, i, a ) => a. findIndex ( t => ( t. name === v. name ) ) === i)
console . log ( uniqueArray) ;
how to remove duplicate array object in javascript
let days = [ "senin" , "senin" , "selasa" , "selasa" , "rabu" , "kamis" , "rabu" ] ;
let fullname = [ { name : "john" } , { name : "jane" } , { name : "imelda" } , { name : "john" } , { name : "jane" } ] ;
const arrOne = new Set ( days) ;
console . log ( arrOne) ;
const arrTwo = days. filter ( ( item, index ) => days. indexOf ( item) == index) ;
console . log ( arrTwo) ;
const arrObjOne = [ ... new Map ( person. map ( item => [ JSON . stringify ( item) , item] ) ) . values ( ) ] ;
console . log ( arrObjOne) ;
const arrObjTwo = Array . from ( new Set ( person. map ( JSON . stringify ) ) ) . map ( JSON . parse ) ;
console . log ( arrObjTwo) ;
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) ) ;
how to remove duplicate values in array of objects using javascript
const array = [ { id : 1 , name : "hello" } , { id : 2 , name : "hii" } , { id : 1 , name : "hey" } ] ;
const cleanArray = array. reduce ( ( unique, o ) => {
if ( ! unique. some ( obj => obj. id === o. id ) ) {
unique. push ( o) ;
}
return unique;
} , [ ] ) ;
remove duplicate object from array javascript
const uniqify = ( array, key ) => array. reduce ( ( prev, curr ) => prev. find ( a => a[ key] === curr[ key] ) ? prev : prev. push ( curr) && prev, [ ] ) ;
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;
}
} , [ ] ) ;
remove duplicates from array of objects
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. 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 object in array javascript
arr. filter ( ( v, i, a ) => a. findIndex ( t => ( t. place === v. place && t. name === v. name ) ) === i)
javascript remove duplicate objects from array es6
const
listOfTags = [ { id : 1 , label : "Hello" , color : "red" , sorting : 0 } , { id : 2 , label : "World" , color : "green" , sorting : 1 } , { id : 3 , label : "Hello" , color : "blue" , sorting : 4 } , { id : 4 , label : "Sunshine" , color : "yellow" , sorting : 5 } , { id : 5 , label : "Hello" , color : "red" , sorting : 6 } ] ,
keys = [ 'label' , 'color' ] ,
filtered = listOfTags. filter (
( s => o =>
( k => ! s. has ( k) && s. add ( k) )
( keys. map ( k => o[ k] ) . join ( '|' ) )
)
( new Set )
) ;
console . log ( filtered) ;
combine 2 "arrays with objects" and remove object duplicates javascript
const joinWithoutDupes = ( A , B ) => {
const a = new Set ( A . map ( x => x. item ) )
const b = new Set ( B . map ( x => x. item ) )
return [ ... A . filter ( x => ! b. has ( x. item ) ) , ... B . filter ( x => ! a. has ( x. item ) ) ]
}
const output = joinWithoutDupes ( [ { item : "apple" , description : "lorem" } , { item : "peach" , description : "impsum" } ] , [ { item : "apple" , description : "dolor" } , { item : "grape" , description : "enum" } ] )
console . log ( output)
remove object if key is duplicate javascript
let array = [ { "sector" : "adad" } , { "sector" : "adadasdsd" } , { "sector" : "sdsdsd" } , { "origin" : "sdfsf" } , { "destination" : "dfsfsdf" } ]
let reduced = array. reduce ( ( a, c, i ) => {
let key = Object . keys ( c) [ 0 ] ;
if ( ! ( key in a) ) a[ key] = [ ] ;
if ( ! a[ key] . includes ( c[ key] ) ) a[ key] . push ( c[ key] ) ;
return a;
} , { } )
console . log ( reduced)
Run code snippet
How to remove all duplicates from an array of objects
obj. arr = obj. arr . filter ( ( value, index, self ) =>
index === self. findIndex ( ( t ) => (
t. place === value. place && t. name === value. name
) )
)
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
const members = [
{ id : 1 , name : 'John' } ,
{ id : 2 , name : 'Jane' } ,
{ id : 1 , name : 'John' } ,
{ id : 4 , name : 'Joe' } ,
] ;
const uniqueMembers = unique (
members,
( a, b ) => ( a. id === b. id ) & ( a. name === b. name )
) ;
console . log ( uniqueMembers) ;
Code language: JavaScript ( javascript)
Duplicate removes from Array of Objects
let key= "orderNumber" ;
[ ... new Map ( this . GetDropsMapAddress . drops . map ( item => [ item[ key] , item] ) ) . values ( ) ] ;
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
Code language: JavaScript ( javascript)
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
Code language: JavaScript ( javascript)
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
Code language: JavaScript ( javascript)
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
Code language: JavaScript ( javascript)
Remove duplicates from an array of objects by multiple properties
function unique ( a, fn ) {
if ( a. length === 0 || a. length === 1 ) {
return a;
}
if ( ! fn) {
return a;
}
for ( let i = 0 ; i < a. length ; i++ ) {
for ( let j = i + 1 ; j < a. length ; j++ ) {
if ( fn ( a[ i] , a[ j] ) ) {
a. splice ( i, 1 ) ;
}
}
}
return a;
}
Code language: JavaScript ( javascript)
remove duplicates objects from an array of objects using javascript
let arr = [
{ id : 1 , name : 'Chetan' } ,
{ id : 1 , name : 'Chetan' } ,
{ id : 2 , name : 'Ujesh' } ,
{ id : 2 , name : 'Ujesh' } ,
] ;
let jsonArray = arr. map ( JSON . stringify ) ;
console . log ( jsonArray) ;
let uniqueArray = [ ... new Set ( jsonArray) ] . map ( JSON . parse ) ;
console . log ( uniqueArray) ;
remove duplicate object from array javascript
let uniqIds = { } , source = [ { id : 'a' } , { id : 'b' } , { id : 'c' } , { id : 'b' } , { id : 'a' } , { id : 'd' } ] ;
let filtered = source. filter ( obj => ! uniqIds[ obj. id ] && ( uniqIds[ obj. id ] = true ) ) ;
console . log ( filtered) ;
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