strange behavior when creating array in javascript

Question

I have following code

 if(ssnFlag == false){
                console.log(userName)
                userSessions.push({userName : [{"sessionId" : dsid}]})
                console.log("pushing::" + JSON.stringify(userSessions[0]))
              }

the output is

OIC_PLAN_ADMIN_OPERATIONS
pushing::{"userName":[{"sessionId":"0000MTEJon9Fs1MLIMK6yf1Ry1Ob0004vf"}]}

Notice when userName value is OIC_PLAN_ADMIN_OPERATIONS then why in the next like the word userName is being pushed when i am expecting it to push OIC_PLAN_ADMIN_OPERATIONS

Jonas Wilms · Accepted Answer · 2018-11-29 19:28:09Z

4

You have to add some brackets to turn it into a "Computed property name":

  { [userName]: /*...*/ }

If you omit them, it is the same as:

 { "userName": /*...*/ }

edited Nov 29, 2018 at 19:28

answered Nov 29, 2018 at 19:25

Jonas Wilms

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2 Comments

user47589 Over a year ago

What is this use of square braces called? I've never seen them used in an object key like this.

user47589 Over a year ago

Disregard, I found it. It was easier to Google than I expected. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

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