There\'s code that reads an IORef and based on some conditions and calculations, creates a new value. Now it writes the new value to that IORef. But there is a chance that it didn\'t get changed at al
I am working through Write Yourself a Scheme in 48 Hours (I\'m up to about 85hrs) and I\'ve gotten to the part about Adding Variables and Assignments. There is a big conceptual jump in this chapter, a
I found some sample code, and changed it a little counter = unsafePerform $ newIORef 0 newNode _ = unsafePer开发者_如何转开发formIO $
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