How to check undefined object properties?

Question

i have to push the drug if either price is there in the object, I wanted to check if object is not undefined/null , does it make sense to these conditions ?

issue is its adding mailPrice when it is coming as {} , any idea ?

main.js

 _.forEach(drugs, function (drug) {
    if ((drug.retailPrice !== undefined && drugPrice.retailPrice !== null)  || (drug.mailPrice !== undefined && drug.mailPrice !== null)) {
          response.push(drug);
        }
});

what is your question ? are you facing any problem with it ? whether it makes sense or not depend how are the values are being used — Code Maniac, Jun 10 '19 at 16:10
Possible duplicate of [How to check for an undefined or null variable in JavaScript?](https://stackoverflow.com/questions/2559318/how-to-check-for-an-undefined-or-null-variable-in-javascript) — Heretic Monkey, Jun 10 '19 at 16:14

score 2 · Accepted Answer · answered Jun 10 '19 at 16:11

2

You can check if an object is empty using Object.keys:

const isEmpty = obj => Object.keys(obj).length === 0;

Now you should be able to do:

if (!isEmpty(drug)) {
  response.push(drug);
}

answered Jun 10 '19 at 16:11

Jose A. Ayllón

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How to check undefined object properties?

1 Answers1