CODEWITHSUNDEEP
javascriptlodash
Michael
Michael

Reputation: 13616

Can't get single value after iteration on array of objects

I use this code to iterate on the JavaScript objects array and return value:

this.selectedClient = _.forEach(self.clients, function (client) {
    if (client.IdentityNumber == -1) {
        return client;
    }
}) 

this.clients=[{firstName:"Tywin", lastName:"Lannister", age:46, IdentityNumber:2},
              {firstName:"Arya", lastName:"Starck", age:46, IdentityNumber:-1},
              {firstName:"John", lastName:"Snow", age:46, IdentityNumber:12},
              {firstName:"Robb", lastName:"Starck", age:46, IdentityNumber:24}];

But after iteration is done I expect that selectedClient veriable will get single item:

{firstName:"Arya", lastName:"Starck", age:46, IdentityNumber:-1}

But instead selectedClient veriable get all items in clients variable.

Any idea why I can't get single value after iteration on clients variable?

Upvotes: 0

Views: 62

Answers (1)

Tushar
Tushar

Reputation: 87203

You cannot return data from forEach.

Copying from the Lodash Docs for forEach

Iteratee functions may exit iteration early by explicitly returning false.

Use _.find().

var selectedClient = _.find(clients, function (client) {
    if (client.IdentityNumber == -1) {
        return client;
    }
});

You can also use shorter syntax with Object as second parameter.

_.find(clients, {IdentityNumber: -1});


var clients = [{
    firstName: "Tywin",
    lastName: "Lannister",
    age: 46,
    IdentityNumber: 2
}, {
    firstName: "Arya",
    lastName: "Starck",
    age: 46,
    IdentityNumber: -1
}, {
    firstName: "John",
    lastName: "Snow",
    age: 46,
    IdentityNumber: 12
}, {
    firstName: "Robb",
    lastName: "Starck",
    age: 46,
    IdentityNumber: 24
}];


var selectedClient = _.find(clients, {IdentityNumber: -1});

console.log(selectedClient);
<script src="https://cdn.jsdelivr.net/lodash/4.13.1/lodash.min.js"></script>

For Vanilla Lovers, use Array#find

clients.find(c => c.IdentityNumber === -1)


var clients = [{
    firstName: "Tywin",
    lastName: "Lannister",
    age: 46,
    IdentityNumber: 2
}, {
    firstName: "Arya",
    lastName: "Starck",
    age: 46,
    IdentityNumber: -1
}, {
    firstName: "Robb",
    lastName: "Starck",
    age: 46,
    IdentityNumber: 24
}];

var selectedClient = clients.find(c => c.IdentityNumber === -1);
console.log(selectedClient);

Upvotes: 4

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