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Question by russellstephens · Dec 10, 2014 at 02:19 AM · expressionside-effectstatment

Expressions in statements must only be executed for their side effects

Trying a simple opacity animation in UnityScript where I fade out one image and replace it with another... Not sure why I'm getting an error message?

 function FadeInEyes () {
 
     t = 0.0f;
 
     for (t; t < 1.0f; t += Time.deltaTime / 0.2f) {
     
         eyesCanvas.alpha += t;
         earsCanvas.alpha -= t;
         
         yield;
 
     }
 
 }

The earsCanvas and eyesCanvas objects are 2D CanvasGroups. I'm having no trouble changing these with 1 or 0 so not sure why this isn't working.

Thanks in advance!

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Answer by Baste · Dec 10, 2014 at 10:59 AM

it's the for loop that's causing you issue. Each of the three parts of the for loop has to be a single valid statement, this one:

 t;

is not a valid statement, and is what's causing the error. The error's saying, in more plain English, that you have a statement that does nothing. In your case, it's the name of a variable that you're not doing anything with.

To fix your issue, move the declaration of t inside the loop:

 for (t = 0.0f; t < 1.0f; t += Time.deltaTime / 0.2f) {

Or, if you're insisting on keeping the declaration outside of the for loop, use an empty statement instead:

 t = 0.0f;
 for (; t < 1.0f; t += Time.deltaTime / 0.2f) {
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avatar image russellstephens · Dec 10, 2014 at 02:05 PM 0
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Thanks so much!

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