CODEWITHSUNDEEP
javascript
KingKongFrog
KingKongFrog

Reputation: 14419

Iterate thought javascript object to see if it has a certain value

I'm trying to figure out the best way to interate through a javascript object to see if one of the keys is set to a certain value. I understand I can do a foreach loop but I feel like there is an easier way.

var myObject =  {
    a: false,
    b: false,
    c: false,
    x: false
}

Id like a quick way to return a true if at least one of those values is set to true, and false if all are false.

Upvotes: 0

Views: 63

Answers (3)

user663031
user663031

Reputation: 

var any_true = false;
JSON.stringify(myObject, function(key, value) { 
    if (value === true) any_true = true; 
});

This uses the callback feature of JSON.stringify. It has the advantage that it finds any true value, even in nested objects.

Upvotes: 0

lante
lante

Reputation: 7336

To return the key that has yourValue as its value, just do:

var yourValue = true;

var key = Object.keys(myObject).filter(function (i) {
    return myObject[i] === yourValue;
})[0];

It will return undefined if no key found.

If you dont need the key and you only need to know if the value is in your object, you can just use the some method:

var hasValue = Object.keys(myObject).some(function (i) {
    return myObject[i] === yourValue;
});

Upvotes: 0

adeneo
adeneo

Reputation: 318182

You have to iterate, but you can do something like this

var hasTrue = Object.keys(myObject).some(function(key) {
    return myObject[key];
});

this uses Array.some and stops as soon as a true value is encountered.

FIDDLE

Upvotes: 4

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