https://wiki.haskell.org/index.php?title=Parametric_polymorphism&feed=atom&action=historyParametric polymorphism - Revision history2024-03-28T23:44:49ZRevision history for this page on the wikiMediaWiki 1.35.5https://wiki.haskell.org/index.php?title=Parametric_polymorphism&diff=51677&oldid=prevBenmachine: Moved content to Polymorphism2012-09-04T21:39:39Z<p>Moved content to <a href="/Polymorphism" title="Polymorphism">Polymorphism</a></p>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Parametric polymorphism is when a function's type signature allows various arguments to take on arbitrary types, but the types must be ''related'' to each other in some way.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>For example, in Java one can write a function that accepts two arguments of any possible type. However, Haskell goes further by allowing a function to accept two arguments of any type so long as they are both ''the same'' type. For example</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"></td>
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</table>Benmachinehttps://wiki.haskell.org/index.php?title=Parametric_polymorphism&diff=38955&oldid=prevRuud Koot: Category:Glossary2011-03-11T15:16:50Z<p><a href="/Category:Glossary" title="Category:Glossary">Category:Glossary</a></p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>which means that the function will accept ''any'' type of list and ''any'' type of function, '''provided''' the types match up. (That is, the function's argument type and the list's element type match.) This makes <hask>map</hask> highly polymorphic, yet there is still no risk of a runtime type mismatch.</div></td>
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</table>Ruud Koothttps://wiki.haskell.org/index.php?title=Parametric_polymorphism&diff=13123&oldid=prevNedervold: fixed typo; added clarification2007-05-21T06:20:24Z<p>fixed typo; added clarification</p>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>which means that the function <del class="diffchange diffchange-inline">well</del> accept ''any'' type of list and ''any'' type of function, '''provided''' the types match up. This makes <hask>map</hask> highly polymorphic, yet there is still no risk of a runtime type mismatch.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>which means that the function <ins class="diffchange diffchange-inline">will</ins> accept ''any'' type of list and ''any'' type of function, '''provided''' the types match up.<ins class="diffchange diffchange-inline"> (That is, the function's argument type and the list's element type match.) </ins> This makes <hask>map</hask> highly polymorphic, yet there is still no risk of a runtime type mismatch.</div></td>
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</table>Nedervoldhttps://wiki.haskell.org/index.php?title=Parametric_polymorphism&diff=13121&oldid=prevQwwqe: typo2007-05-20T22:15:41Z<p>typo</p>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Parametric polymorphism is when a function's type signature allows various arguments to take on arbitrary types, but the types <ins class="diffchange diffchange-inline">must</ins> be ''related'' to each other in some way.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>For example, in Java one can write a function that accepts two arguments of any possible type. However, Haskell goes further by allowing a function to accept two arguments of any type so long as they are both ''the same'' type. For example</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>For example, in Java one can write a function that accepts two arguments of any possible type. However, Haskell goes further by allowing a function to accept two arguments of any type so long as they are both ''the same'' type. For example</div></td>
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</table>Qwwqehttps://wiki.haskell.org/index.php?title=Parametric_polymorphism&diff=11997&oldid=prevMathematicalOrchid: ...have I got this right?2007-03-16T21:56:27Z<p>...have I got this right?</p>
<p><b>New page</b></p><div>Parametric polymorphism is when a function's type signature allows various arguments to take on arbitrary types, but the types most be ''related'' to each other in some way.<br />
<br />
For example, in Java one can write a function that accepts two arguments of any possible type. However, Haskell goes further by allowing a function to accept two arguments of any type so long as they are both ''the same'' type. For example<br />
<br />
As a specific (and slightly more complicated) example, the well-known <hask>map</hask> function has a parametrically polymorphic type<br />
<br />
<haskell><br />
map :: (a -> b) -> [a] -> [b]<br />
</haskell><br />
<br />
which means that the function well accept ''any'' type of list and ''any'' type of function, '''provided''' the types match up. This makes <hask>map</hask> highly polymorphic, yet there is still no risk of a runtime type mismatch.</div>MathematicalOrchid