Fooling around with typescript

tsfun/.gitignore

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+node_modules/

tsfun/greeter.js

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+var Student = /** @class */ (function () {
+    function Student(firstName, middleInitial, lastName) {
+        this.firstName = firstName;
+        this.middleInitial = middleInitial;
+        this.lastName = lastName;
+        this.fullName = firstName + " " + middleInitial + " " + lastName;
+    }
+    return Student;
+}());
+function greeter(person) {
+    return "Hello, " + person.firstName + " " + person.lastName;
+}
+var user = new Student("Jane", "M.", "User");
+console.log(greeter(user));

tsfun/greeter.ts

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+class Student {
+  fullName: string;
+  constructor(
+    public firstName: string,
+    public middleInitial: string,
+    public lastName: string
+  ) {
+    this.fullName = firstName + " " + middleInitial + " " + lastName;
+  }
+}
+
+interface Person {
+  firstName: string,
+  lastName: string;
+}
+
+function greeter(person: Person) {
+  return "Hello, " + person.firstName + " " + person.lastName;
+}
+
+let user = new Student("Jane", "M.", "User");
+
+console.log(greeter(user));

tsfun/package.json

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+{
+  "devDependencies": {
+    "typescript": "^3.7.2"
+  },
+  "license": "MIT"
+}

tsfun/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+typescript@^3.7.2:
+  version "3.7.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.7.2.tgz#27e489b95fa5909445e9fef5ee48d81697ad18fb"
+  integrity sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==