<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Dec 10, 2009, at 2:43 AM, YC wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Lucida Grande'; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><p id="x_ul" style="margin-left: 40px; ">Having a<span class="Apple-converted-space"> </span><span class="emphasis"><em>static</em></span><span class="Apple-converted-space"> </span>type system means that the compiler knows the type of every value and expression at compile time, before any code is executed.</p><div><br></div></span></blockquote><br></div><div><br></div><div>This is of course true for Scheme programs. </div><div><br></div><div>TST (The Scheme Type) is one of: </div><div> -- Number </div><div> -- Char </div><div> -- Symbol </div><div> ...</div><div> -- TST -> TST </div><div> -- TST TST -> TST </div><div> ...</div><div><br></div><div>Then fact is that each expression has type TST. </div><div><br></div><div>RealWorldHaskell is probably good at explaining how to use the language to count sheep. </div><div>Your quotes suggest that these people haven't studied PL. </div></body></html>