1 files changed, 19 insertions, 3 deletions
diff --git a/pbt/ts/src/bank.ts b/pbt/ts/src/bank.ts
index e5619f4..e388354 100644
--- a/pbt/ts/src/bank.ts
+++ b/pbt/ts/src/bank.ts
@@ -1,4 +1,4 @@
-import {Option, fromNullable} from 'fp-ts/lib/Option';
+import {Option, fromNullable, isSome, matchW} from 'fp-ts/lib/Option';
 
 // keep it simple
 export type Account = string;
@@ -32,11 +32,27 @@ export class SimpleBank implements Bank {
   }
 
   deposit(account: Account, amt: number): void {
-    throw new Error('Method not implemented.');
+    const current = this.balance(account);
+    matchW(
+      () => {
+        throw new Error(`Unknown account ${account}`);
+      },
+      (bal: number) => {
+        this.accounts.set(account, bal + amt);
+      },
+    )(current);
   }
 
   withdraw(account: Account, amt: number): void {
-    throw new Error('Method not implemented.');
+    const current = this.balance(account);
+    matchW(
+      () => {
+        throw new Error(`Unknown account ${account}`);
+      },
+      (bal: number) => {
+        this.accounts.set(account, bal - amt);
+      },
+    )(current);
   }
 }