add js-fp3

js-fp3/index.js

@@ -0,0 +1,54 @@
+import { randomUUID } from 'crypto';
+import { catchResult, bind, tap, tapError, mapError, pipe } from './library/result.js';
+import { output, outputError } from './library/logging.js';
+import { createInMemoryRepository, innerAccountError } from './infrastructure/repository.js';
+import { openAccount } from './domain/account.js';
+import { createMoney } from './domain/money.js';
+import { createWithdrawMoney } from './application/accountApp.js';
+
+/**
+ * @param {string} src
+ * @param {string} msg
+ * @returns {<T, E>(result: import('./library/result.js').Result<T, E>) => import('./library/result.js').Result<T, E>}
+ */
+const log = (src, msg) => (result) =>
+  tap((x) => output(src, msg)(x))(tapError((e) => outputError(src, e))(result));
+
+/**
+ * @param {string} src
+ * @param {(x: T) => string} renderText
+ * @returns {<T, E>(result: import('./library/result.js').Result<T, E>) => import('./library/result.js').Result<T, E>}
+ */
+const logWith = (src, renderText) => (result) =>
+  tap((x) => output(src, renderText(x))(x))(tapError((e) => outputError(src, e))(result));
+
+console.log('[js-fp3] Starting withdraw money demo...');
+
+const accountId = randomUUID();
+
+// Try changing this to 250 to see an error being handled
+const withdrawalAmount = 100;
+
+pipe(
+  catchResult(
+    createInMemoryRepository,
+    (ex) => ({ type: 'RepositoryCreationFailed', message: ex.message })
+  ),
+  bind((repo) =>
+    pipe(
+      createWithdrawMoney(repo),
+      bind((withdrawMoney) =>
+        pipe(
+          openAccount(accountId, createMoney(200)),
+          logWith('js-fp3 seed', (account) => `Seeding account ${account.id} with opening balance ${account.balance.amount.toFixed(2)}`),
+          bind(repo.saveAccount),
+          log('js-fp3 exec', `Executing withdrawal ${withdrawalAmount.toFixed(2)} from account ${accountId}`),
+          bind(() => withdrawMoney(accountId, withdrawalAmount)),
+          logWith('js-fp3 new balance', (account) => `New balance is ${account.balance.amount.toFixed(2)}`),
+          mapError((ae) => innerAccountError(ae))
+        )
+      )
+    )
+  ),
+  log('js-fp3 done', 'Demo completed.')
+);