Added 17.5

Author: mattpocock

src/04-generics-advanced/17.5-inference-inside-generic-functions.problem.ts

@@ -0,0 +1,16 @@
+type Person = {
+  name: string;
+  age: number;
+  birthdate: Date;
+};
+
+export function remapPerson<Key extends keyof Person>(
+  key: Key,
+  value: Person[Key],
+): Person[Key] {
+  if (key === "birthdate") {
+    return new Date();
+  }
+
+  return value;
+}

src/04-generics-advanced/17.5-inference-inside-generic-functions.solution.ts

@@ -0,0 +1,16 @@
+type Person = {
+  name: string;
+  age: number;
+  birthdate: Date;
+};
+
+export function remapPerson<Key extends keyof Person>(
+  key: Key,
+  value: Person[Key],
+): Person[Key] {
+  if (key === "birthdate") {
+    return new Date() as Person[Key];
+  }
+
+  return value;
+}