random

(random limit)

Returns a random number in the half-open interval [0, limit). The result type follows the limit: an integer limit yields an integer, a float limit yields a float (so (random 1) is always 0). The interpreter and JVM draw from Math.random; WASM draws real entropy from the WASI host (random_get in Preview 1, wasi:random under --component), so the sequence differs on every run.