For methods that don't need arguments (.toUpperCase(), toLowerCase()) can you put a parameter inside the parenthesis?

Question

I learned ruby first so these empty parenthesis on the end of these methods feel strange.  I understand that they are invoking the function, but is there any situation where you would put something between the parenthesis?

eck · Accepted Answer

You can put any data type in the parentheses, but nothing different will happen, since those method you mention do not do anything with arguments.
If you go into your console and run 'test'.toUpperCase(true, false, null, 5); everything will work the same as it would if you had left the parens empty.
You can also try entering the following: 
```
function example(){
  return 'my example!';
}
example(1, 2, 3);  // should return 'my example!'
```

Steven Parker · Answer

The string you attach it to actually is the first argument (internally it is called this), so putting something inside the parentheses would be giving it a second argument.  But it's only defined to use one.

Tushar Singh · Answer

I don't think so.I mean what can you put inside the lower case as a parameter? If "foo".toUpperCase(some parameter) is a valid syntax ,I have never seen it yet. And it dosen't say anything in the documentation pages, so answer is probably no.
MDN (https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase)

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Casey Courtney

Casey Courtney

For methods that don't need arguments (.toUpperCase(), toLowerCase()) can you put a parameter inside the parenthesis?

3 Answers

eck

eck

Casey Courtney

Casey Courtney

Steven Parker

Steven Parker

Casey Courtney

Casey Courtney

Tushar Singh

Tushar Singh

Casey Courtney

Casey Courtney