reference

Mutant Playground Examples

Browser-safe learning snippets for the Mutant playground and quick local testing.

Mutant Playground Examples

Purpose

These examples are designed for teaching and quick experimentation. They are grouped by feature and can be copied into the browser playground.

Expressions And Output

2 + 40

putln("Mutant WASM REPL")
putf("score=%d, mode=%s", 98, "sandbox")

Collections

putln(first([10, 20, 30]))
putln(last([10, 20, 30]))
putln(rest([10, 20, 30]))
putln(len([10, 20, 30, 40]))

JSON

let obj = {"tool": "mutant", "ok": true}
putln(json_stringify(obj))

Builtin Help

help()

Notes

• If a snippet fails in browser mode, verify whether the builtin is restricted by sandbox policy.
• For browser runtime capability details and API contracts, see /docs/reference/wasm_repl_reference.
• Keep examples small and composable; stack them as you learn each feature.