reactjs, comparison using array from document

Question

I have a document being passed into a function which has the format 0:{username:"test", name:"TestName"} and everything prints in the console properly, but when I try to access userName from it I get an undefined error.

My code currently:

const newuserDocs = result.docs;         

console.log(newuserDocs);

if(this.newUserDocs.username === "test"){
  console.log('THE USERNAME IS GOOD');
}

I know that newUserDocs is set because I can dump it in the console or elsewhere just fine but trying to do this comparison is failing at the .username portion

What am I doing wrong

elvira.genkel · Accepted Answer · 2020-03-29 22:44:19Z

1

Seems that keyword this is ambigous, as soon as newuserDocs is defined as variable you can access is without this. portion as soon as context for this is unclear in your example:

if(this.newUserDocs.username === "test"){
  console.log('THE USERNAME IS GOOD');
}

UPD: js is case sensitive. Your variable is called newuserDocs (lower-case U) and then your access it by newUserDocs (upper-case U). Try newuserDocs.username

edited Mar 29, 2020 at 22:44

answered Mar 29, 2020 at 22:37

elvira.genkel

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6 Comments

Geoff_S Over a year ago

If i try just as newUserDocs.username then it says newUserDocs is undefined

elvira.genkel Over a year ago

js is case sensitive. Your variable is called newuserDocs (lower-case U) and then your access it by newUserDocs (upper-case U). Try newuserDocs.username

Geoff_S Over a year ago

oh wow, not sure how I missed that. however, I changed it and it still says 'cannot read property 'username' of undefined

Geoff_S Over a year ago

Wait, I got it to clear the error due to the same issue with userName. But it's not printing my console even though the username matches

elvira.genkel Over a year ago

Hmm, And the last idea accoding to your data format, newuserDocs[0].username

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ESI · Accepted Answer · 2020-03-29 23:20:07Z

1

I run this, it works perfect. You missed:

You have to approach the variable without use this..

The spelling of the const.

const newuserDocs = {username:"test", name:"TestName"};

console.log(newuserDocs);

if(newuserDocs.username === "test"){
  console.log('THE USERNAME IS GOOD');
}

I hope it helps you.

edited Mar 29, 2020 at 23:20

answered Mar 29, 2020 at 23:12

ESI

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