feat: add haskell str concat ops til

jthodge · Aug 12, 2024 · a1fa1ff · a1fa1ff
1 parent 19d0eda
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Showing 1 changed file with 35 additions and 0 deletions.
diff --git a/haskell/string-concatenation-operators.md b/haskell/string-concatenation-operators.md
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+# String Concatenation Operators
+
+E.g. the following two functions:
+
+## `++`
+
+```haskell
+wrapHtml content = "<html><body>" ++ content ++ "</body></html>"
+```
+
+## `<>`
+
+```haskell
+wrapHtml content = "<html><body>" <> content <> "</body></html>"
+```
+
+## Operator Comparison
+
+### Operator
+
+`++` is the traditional list concatenation operator in Haskell, while `<>` is the more general "mappend" operator from the `Semigroup` typeclass.
+
+### Type flexibility
+
+`++` works only with lists (including strings, which are lists of characters), while `<>` can work with any type that implements the `Semigroup` typeclass, including `String`, `Text`, `ByteString` (and others).
+
+### Performance
+
+For strings, `<>` can be more efficient, especially when working with `Text` or `ByteString` types, as it allows for optimized concatenation.
+
+### Readability
+
+Some developers find `<>` more readable, especially when dealing with multiple concatenations.
+
+In practice, for simple string concatenation like the examples above, both will work identically with `String` types. However, using `<>` more extensible and improves flexibility, because the underlying string representation (e.g., to `Text`) can be changed in the future.