sortOutput option for challenges

Author: almost

Diff for: src/challenges/types.ts

@@ -18,6 +18,7 @@ export interface Assertion<
 > {
   input: A;
   output: R | ((play: (...args: A) => R, input: A) => R);
+  sortOutput?: boolean;
 }
 
 export interface Challenge<
@@ -27,7 +28,7 @@ export interface Challenge<
   title: string;
   description: string;
   example: Example<A, R>;
-  assertions: readonly Assertion<A, R>[];
+  assertions: Assertion<A, R>[];
   assertRules?: (playString: string) => void;
   context?: Record<string, unknown>;
   timeLimitMinutes?: number;

Diff for: src/challenges/utils.ts

@@ -52,9 +52,9 @@ export const getChallenges = async (challengeDir: string) => {
         key,
         solution: fs.readFileSync(solutionPath, UTF8),
         ...challenge,
-        example: `(${challenge.example.input
+        example: `play(${challenge.example.input
           .map(formatValue)
-          .join(', ')}) => ${formatValue(challenge.example.output)}`,
+          .join(', ')}) ==== ${formatValue(challenge.example.output)}`,
       };
     })
   );

Diff for: src/game/verifier.ts

@@ -81,6 +81,11 @@ process.on('message', (entry: VerifyJob) => {
               )
             : assertion.output;
 
+        if (assertion.sortOutput && Array.isArray(result) && Array.isArray(expected)) {
+          result.sort();
+          expected.sort()
+        }
+
         if (!lodash.isEqual(result, expected)) {
           throw new Error(
             `Expected ${formatTypeAndValue(