How to get the count of boolean value in just object

Question

I have to get the length of boolean value (if it is true) in just an object. Can anyone help me solve this?

var data = {
             mo: true, 
             tu: true, 
             we: true, 
             th: true, 
             fr: true, 
             sa: false, 
             su: false
           };

`total = 0;for (k in data) total += data[k]`. In numeric operations, `true` is `1` and `false` is `0`, so.... — Adelin, Jul 11 '18 at 07:20
In a modern environment, I'd probably do `let count = 0; for (const flag of Object.values(data)) { if (flag) { ++total; } }`, but [you have lots of options](https://stackoverflow.com/a/51263127/157247). As @Adelin points out, you could make use of the fact that a boolean when converted to a number is 1 if true or 0 if false, so just `total += flag;` in the loop would work too. — T.J. Crowder, Jul 11 '18 at 07:21

score 3 · Answer 1 · answered Jul 11 '18 at 07:22

Here are two ways to do it (modern & shorter vs. backwards-compatible & longer):

var data = {
             mo: true, 
             tu: true, 
             we: true, 
             th: true, 
             fr: true, 
             sa: false, 
             su: false
           };

const short = Object.values(data).filter((v) => v).length;

var long = 0;

for (var prop in data) {
  if (data.hasOwnProperty(prop) && data[prop]) {
    long++;
  }
}

console.log(short, long);

In the modern version, we take only the values in the object, filter out any that aren’t truthy, and take the length of the resulting array.

In the backwards-compatible version, we loop through the properties of the object, filter out any that aren’t its own properties or aren’t truthy, and increment the count.

Woah! this one worked like a charm. **Thank you so much!** Sorry, I couldn't up-vote for your answer guys. I'm really grateful — Pradeep, Jul 11 '18 at 07:27

score -1 · Answer 2 · answered Jul 11 '18 at 07:21

-1

Here is a simple way to do it

function totalBoolean(data){
 booleanTotal = 0;
 for (key in data) 
 booleanTotal += data[key]
 return booleanTotal;
}

var total = totalBoolean(data)

answered Jul 11 '18 at 07:21

Jeffin

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How to get the count of boolean value in just object

2 Answers2