CODEWITHSUNDEEP
javascript
john doe
john doe

Reputation: 9660

Find if a Property is Valid inside JavaScript Array of Objects

I have a collection of Customer objects inside the JavaScript Array. 

var customer = Customer(); 
customer.firstName = "John"; 
customer.isEnabled = true 

var customer2 = Customer(); 
customer2.firstName = "Mary"; 
customer2.isEnabled = false

var customers = [customer,customer2];

Now, I want to return true if any of the objects inside the customers array property "isEnabled" = false. Basically I want a way to validate a property of every object that is inside the array (customers).

UPDATE:

So using the some function I can do something like this: 

customers.some(e => e.isEnabled == true)

So, now it will only return true if all the elements in the array have isEnabled property to true. Is that right?

Upvotes: 1

Views: 85

Answers (4)

user850323
user850323

Reputation: 188

If you are using Underscore.js, You could use _.where() function. 

_.where(customers, {isEnabled: true});

Upvotes: 0

lleaff
lleaff

Reputation: 4309

What you want is Array.prototype.some or Array.prototype.every

Here is how you'd use it in your case:

var customers = [
    { firstName: "John", isEnabled: true },
    { firstName: "Mary", isEnabled: false },
];

var goodCustomers = [
    { firstName: "George", isEnabled: true },
    { firstName: "Sandra", isEnabled: true },
];

function isNotEnabled(customer) {
    return !customer.isEnabled;
}
function isEnabled(customer) {
    return customer.isEnabled;
}

customers.some(isNotEnabled);
//=> true
goodCustomers.some(isNotEnabled);
//=> false

customers.every(isEnabled);
//=> false
goodCustomers.every(isEnabled);
//=> true

Functional libraries are also excellent for this kind of problem, here's a Ramda example just for fun:

R.all(R.prop("isEnabled"), customers);
//=> false
R.any(R.compose(R.not, R.prop("isEnabled")), customers);
//=> true

Upvotes: 3

RomanPerekhrest
RomanPerekhrest

Reputation: 92854

Use every method:

customers.every(function(v){ return v.isEnabled;  }); // will return true if every object 'is enabled'

Upvotes: 0

amahfouz
amahfouz

Reputation: 2398

Checkout the lodash library. It has lots of such functions already written for you.

Upvotes: -2

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