I would like to set a param for knowing what uri to use when a certain port is called.

Here is my code:

  var portConfig = '443';
    (portConfig === '443') ? uri = 'wss://' : uri = 'http://';
    console.log(uri);
    var Ip = uri + "hereis.myurl";
    var port = portConfig;
    console.log(Ip);

I am getting the following error:

Expected an assignment or function call and instead saw an expression

I have even set the uri's to be inside of a function testA testB but the same error occurs. I have read up on the issue and it just seems like an erroneous error. Should I use the if statement instead -- which works fine?

I would like to set a param for knowing what uri to use when a certain port is called.

Here is my code:

  var portConfig = '443';
    (portConfig === '443') ? uri = 'wss://' : uri = 'http://';
    console.log(uri);
    var Ip = uri + "hereis.myurl.";
    var port = portConfig;
    console.log(Ip);

I am getting the following error:

Expected an assignment or function call and instead saw an expression

I have even set the uri's to be inside of a function testA testB but the same error occurs. I have read up on the issue and it just seems like an erroneous error. Should I use the if statement instead -- which works fine?

• javascript
• ternary-operator

Share Improve this question Follow edited Jul 22, 2016 at 20:19 nicael 19.1k1313 gold badges6262 silver badges9292 bronze badges asked Jul 22, 2016 at 20:18 Christian MatthewChristian Matthew 4,38955 gold badges3737 silver badges4747 bronze badges 1

• A ternary can't contain assigment, the returned value could however be assigned. – adeneo Commented Jul 22, 2016 at 20:21

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2 Answers 2

Sorted by: Reset to default 7

The correct way per documentation is:

uri = (portConfig === '443') ? 'wss://' : 'http://';

It does indeed expect the assignment, not the expression.

In fact, the way you use could be eaten and parsed without the errors by the browser, since an assignment returns the assigned value. But it's not the remended way, since the ternary operators were designed to return the value (and they do it always, even if you don't use the value afterwards), unlike if() conditions, and it's considered not wise to use it like you use if().

This is how you should write it

uri =  (portConfig === '443') ? 'wss://' : 'http://';