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+---
+id: "type-parameter"
+keywords: ["type", "parameter", "generics", "placeholder"]
+name: "'a"
+summary: "This is a `type parameter`."
+category: "languageconstructs"
+---
+
+Types may be declared with [type parameters](/docs/manual/latest/type#type-parameter-aka-generic) (also known as _generics_ in other languages) to create generalized versions of those types.
+
+### Example with one type parameter
+
+<CodeTab labels={["ReScript", "JS Output"]}>
+
+```res
+type point2D<'a> = ('a, 'a)
+
+let intPoint: point2D<int> = (1, 2)
+let floatPoint: point2D<float> = (1.0, 2.0)
+```
+
+```js
+var intPoint = [1, 2];
+var floatPoint = [1.0, 2.0];
+```
+
+</CodeTab>
+
+### Example with multiple type parameters
+
+<CodeTab labels={["ReScript", "JS Output"]}>
+
+```res
+type either<'a, 'b> = This('a) | That('b)
+
+let value1: either<int, string> = This(123)
+let value2: either<int, string> = That("Hello")
+```
+
+```js
+var value1 = {
+  TAG: /* This */ 0,
+  _0: 123,
+};
+
+var value2 = {
+  TAG: /* That */ 1,
+  _0: "Hello",
+};
+```
+
+</CodeTab>
+
+### References
+
+- [Type parameters](/docs/manual/latest/type#type-parameter-aka-generic)