find sum of Boolean values JavaScript object array

Question

Hi i am trying to find the sum of Boolean values in the object array in JavaScript

My json like be

var myoBj = [{
  \"id\": 1,
  \"day\": 1,
  \"st         


        

Answer 1

var result = myObj.reduce((sum, next) => sum && next.status, true);

This should return true, if every value is true.

Answer 2

If you must use reduce you can take advantage of the fact that x*false == 0, and so you can do the following:

const myObj=[{id:1,day:1,status:true},{id:2,day:1,status:false},{id:3,day:1,status:false},{id:4,day:3,status:false}],

res = !!myObj.reduce((bool, {status}) => bool*status, true);
console.log(res);

Answer 3

You could use Array.some with predicate a => !a.status or Array.every with predicate a => a.status.

Either of them will short-circuit if you find a mismatch, while Array.reduce will not.

Answer 4

If you want to sum lets say, day items value depending on the status flag, this can looks like:

var result = myObj.reduce((res, item) => item.status ? res + item.day : res, 0);

Update 1

For overall status in case of all statuses are true you should use every method:

var result = myObj.every(item => item.status);