find sum of Boolean values JavaScript object array

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);

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

This should return true, if every value is true.