Handling Undefined

Queries and Resources
1

Hello, it's me again, with my dynamic data.

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My question is:
How should I compare a variable which returns undefined?
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The case:
Currently I am handling my error message.
My data result has dynamic result, depends on the error:

EX:
{
"errors": {
"invitedTeamIds": [
"The value 'asdf' is not valid."
],
"restrictedTeamIds": [
"The value 'test' is not valid."
]
}
}

So the invitedTeamIds here is not always appear.
It can become something like:

{
"errors": {
"restrictedTeamIds": [
"The value 'test' is not valid."
]
}
}

if the input for the invitedTeamIds is correct, the object won't error.
Now, the problem is, since I need to check if the object first (if it is exist or not), I made something like

if ({{Resource.data.data.errors.invitedTeamIds }} != {{null}} ||
{{Resource.data.data.errors.invitedTeamIds }} != '')
{
result.push({{Resource.data.data.errors.invitedTeamIds}});
}

but the validation (which compares to null and string empty) returned true (because it returns undefined).
Which will put "undefined" text to my result array.
image

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SO... Any idea how should I compare the variable with, so it will detect the undefined?

2

You should be able to detect undefined, it's a global eg

if({{Resource.data.data.errors.invitedTeamIds}} !== undefined) {

Not sure if that answers your question as I'm not clear what output you're expecting - the error object seems to only show errors, not empty error arrays, so your results array and error array are going to be the same?

3

Yup, it works.
Thank you.

btw... I also found I can convert it to string
so it is something like
if(String({{Resource.data.data.errors.invitedTeamIds}}) != 'undefined') {