Find if a Property is Valid inside JavaScript Array of Objects

Question

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?

lleaff · Accepted Answer · 2015-12-30 19:45:00Z

3

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

edited Dec 30, 2015 at 19:45

answered Dec 30, 2015 at 19:22

lleaff

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4 Comments

john doe Over a year ago

Basically it should only return true if all the items with their property isEnabled is true in the array.

lleaff Over a year ago

Yes, I misunderstood you a bit, included another example with [].every()

john doe Over a year ago

Thanks! I think I worded my question poorly. Sorry for that. every() is awesome!

lleaff Over a year ago

You're welcome. Also the lodash advice isn't bad per se, even though it's a bit overkill for your problem, it allows you to use that kind of programming style in a lot of other scenarios (and it'd be more elegant). There's Ramda also.

RomanPerekhrest · Accepted Answer · 2015-12-30 19:31:30Z

0

Use every method:

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

answered Dec 30, 2015 at 19:31

RomanPerekhrest

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Comments

user850323 · Accepted Answer · 2015-12-30 19:58:31Z

0

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

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

answered Dec 30, 2015 at 19:58

user850323

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Comments

amahfouz · Accepted Answer · 2015-12-30 19:28:05Z

-2

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

answered Dec 30, 2015 at 19:28

amahfouz

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