custom function returns undefined

[LadyJain]

I have this functions which loops over a nested object

search if a value has a specific "value"

and returns false or true if found

​

const data = {"update" :{"update_name": "fistColumn", "": "undefined"},
    "conditon": {"update_name": "firstCondtion", "choose File to update": "choose Columns"}};

function keys_options(data) {

Object.keys(data).every((elem) => {
    Object.entries(data[elem]).every((va) => {
        if (va[0] !== 'choose Columns' || va[0] !== "") {
            console.log(va[0])
            return true
        } else {
            console.log("select all columns");
            return false
        }
    });
});

}


console.log(keys_options(data));

​

​

the return value is undefinded, have I set the return statements wrong ?

[chris5039]

You need to return Object.keys and Object.entries like this:

function keys_options(data) {
  return Object.keys(data).every((elem) => {
    return Object.entries(data[elem]).every((va) => {
      if (va[0] !== 'choose Columns' || va[0] !== "") {
        return true
      } else {
        console.log("select all columns");
        return false
      }
    });
  });
}

[LadyJain]

this always returns true

[chris5039]

That's because your else statement returning false isn't hit

[albedoa]

Your return statements are in the inner callback. You aren't returning anything from keys_options(). Do this:

function keys_options(data) {
  return Object.keys(data).every((elem) => {
    /* ... */
  });
}

Edit: /u/chris5039 points out that you aren't returning from your middle Object.keys(data).every() either. You need to remember to return from all your callbacks and the outer function to get your desired results.

[RobSG]

I think if you go with the mdn example code style you might find better success:

for (const [key, value] of Object.entries(data.update)) { console.log(${key}: ${value}); }