remove the second occurrence of array object with same name

May 3, 2022

I have this array (java script array of objects)

users=[{name:'arrow',age:50,id:444}
       {name:'bow',age:66,id:884}
       {name:'arrow',age:30,id:99},
       {name:'apple',age:50,id:999}
       {name:'bow',age:50,id:9669}]

I want to remove second occurrence of same name , in this case , I want to remove {name:'arrow',age:30,id:99} and {name:'bow',age:50,id:9669} and retain first occurrences{name:'arrow',age:50,id:444} and {name:'bow',age:66,id:884}

Resulting array should be :

users=     [{name:'arrow',age:50,id:444}
           {name:'bow',age:66,id:884},
           {name:'apple',age:50,id:999}]

>Solution :

const users = [
    { name: 'arrow', age: 50, id: 444 },
    { name: 'bow', age: 66, id: 884 },
    { name: 'arrow', age: 30, id: 99 },
    { name: 'apple', age: 50, id: 999 },
    { name: 'bow', age: 50, id: 9669 }
]

const uniqueUsers = users.reduce((acc, user) => {
    if (!acc.find(u => u.name === user.name)) {
        acc.push(user)
    }
    return acc
}, [])