add lesson 10

getBoolean · getBoolean · commit aa5a54bd4c25 · 2021-11-26T12:33:28.000-06:00
diff --git a/src/sandbox.ts b/src/sandbox.ts
@@ -1,12 +1,4 @@
-// let greet: Function = () => {
-//   console.log('hello, world');
-// }
-
-// greet = 'hello';
-
-// greet = () => {
-//   console.log('hello, again');
-// }
+/// Lesson 9
 
 type StringOrNum = string | number;
 type objWithName = { name: string, uid: StringOrNum };
@@ -21,4 +13,31 @@ const greet = (user: objWithName) => {
 
 const greetAgain = (user: objWithName) => {
   console.log(`${user.name} says hello again`);
+}
+
+/// Lesson 10
+
+// let greet: Function
+
+// example 1
+let greetF: (a: string, b: string) => void;
+greetF = (name: string, greeting: string) => {
+  console.log(`${name} says ${greeting}`);
+}
+
+// example 2
+let calc: (a: number, b: number, c: string) => number;
+calc = (numOne: number, numTwo: number, action: string): number => {
+  if (action === 'add') {
+    return numOne + numTwo;
+  } else {
+    return numOne - numTwo;
+  }
+}
+
+// example 3
+type person = { name: string, age: number };
+let logDetailsO: (obj: { name: string, age: number }) => void;
+logDetailsO = (ninja: person) => {
+  console.log(`${ninja.name} is ${ninja.age} years old`);
 }
