Check if any key values are false in an object

Question

Question:

I'm looking for a simple solution to check if any key values are false in an object.

I have an object with several unique keys, however, they only contain boolean values ( true or false )

var ob = {  stack: true, 
            overflow: true, 
            website: true 
         };

I know that I can get the number of keys in an Object, with the following line:

Object.keys(ob).length // returns 3

Is there a built in method to check if any key value is false without having to loop through each key in the object?

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Solution:

To check if any keys - use Array.prototype.some() .

// to check any keys are false
Object.keys(ob).some(k => !ob[k]); // returns false

To check if all keys - use Array.prototype.every() .

// to check if all keys are false 
Object.keys(ob).every(k => !ob[k]); // returns false 

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Answer 1

您可以使用Array.some方法：

var hasFalseKeys = Object.keys(ob).some(k => !ob[k]);

Answer 2

Here's how I would do that:

Object.values(ob).includes(false);      // ECMAScript 7

// OR

Object.values(ob).indexOf(false) >= 0;  // Before ECMAScript 7

Answer 3

You can create an arrow function isAnyKeyValueFalse , to reuse it in your application, using Object.keys() and Array.prototype.find() .

Code:

 const ob = { stack: true, overflow: true, website: true }; const isAnyKeyValueFalse = o => !!Object.keys(o).find(k => !o[k]); console.log(isAnyKeyValueFalse(ob));

Answer 4

To check if all values are false

Object.values(ob).every(v => !v);