Converting a string to lower case

Converting a string to lower case

How to:

In Clojure, to convert a string to lower case, you’ll use the clojure.string/lower-case function. Look how simple it is:

(require '[clojure.string :as str])

(str/lower-case "Hello, World!") ; => "hello, world!"

Output is straightforward:

"hello, world!"

Deep Dive

Historically, case conversion has been around since early computing to harmonize text data processing. In Clojure, the clojure.string/lower-case function is part of the clojure.string library, a collection of utilities for string manipulation included in the core language.

Alternatives to clojure.string/lower-case include rolling your own function through mapping with char manipulation, but this is reinventing the wheel when you have a built-in function that’s optimized and well-tested.

Internally, clojure.string/lower-case hands off the heavy lifting to Java’s own toLowerCase method, since Clojure runs on the Java Virtual Machine (JVM). This ensures high performance as it leverages Java’s mature libraries.

See Also