ts crash course

Author: Dhaneshwar7

.DS_Store

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+node_modules

.gitignore

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+var fullname = 'Banglore';
+fullname = 'Del';
+var num;
+num = 23;
+var names = [];
+names.push('s');
+function sum(a, b) {
+    return a + b;
+}
+// console.log(sum(7, 2));
+//Tuples
+var address;
+address = [111, 'bhopal', 46331];
+var person;
+person = { firstName: 'Jojo Mike' };
+var anotherPerson;
+anotherPerson = { firstName: 'Nilesh', age: 21 };
+function add(a, b) {
+    // optional only last parameters
+    return b ? a + b : a;
+}
+console.log(add('2', '5'));
+var p = {
+    name: 'delta',
+    id: 34,
+    age: 34,
+};
+console.log(p);
+//Union
+var p1;
+p1 = { name: 'APJ Abdul Kalam', age: 80, id: 23 };
+p1 = { name: 'Lal Bahadur Shashtri', age: 70, id: 2 };
+console.log(p1);
+//InterSection
+var p2;
+p2 = { name: 'Sam Bahadur', id: 234, age: 96, rollNo: 1 };
+var c;
+c = 1;
+c = 'one';
+var n = []; // never array
+//n.push('hello'); // can't push it never type
+//classes
+var Car = /** @class */ (function () {
+    function Car(brand) {
+        this.brand = brand;
+    }
+    Car.prototype.getBrand = function () {
+        console.log(this.brand);
+    };
+    return Car;
+}());
+var c1 = new Car('Maruti');
+c1.getBrand();
+//public
+var CarX = /** @class */ (function () {
+    function CarX(brand) {
+        this.brand = brand;
+    }
+    CarX.prototype.getBrand = function () {
+        console.log(this.brand);
+    };
+    return CarX;
+}());
+var c2 = new Car('Lamborgini');
+c2.getBrand();
+console.log(c2.brand);
+//private
+var CarY = /** @class */ (function () {
+    function CarY(brand) {
+        this.brand = brand;
+    }
+    CarY.prototype.getBrand = function () {
+        console.log(this.brand);
+    };
+    return CarY;
+}());
+var c3 = new CarY('Jaguar');
+c3.getBrand();
+// c3.brand
+//protected
+var CarZ = /** @class */ (function () {
+    function CarZ(brand) {
+        this.brand = brand;
+    }
+    CarZ.prototype.getBrand = function () {
+        console.log(this.brand);
+    };
+    return CarZ;
+}());
+var c4 = new CarZ('Tata');
+c4.getBrand();
+// c3.brand

11_CrashCourse/index.js

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+let fullname: string = 'Banglore';
+fullname = 'Del';
+
+let num: number;
+num = 23;
+
+const names: string[] = [];
+names.push('s');
+
+function sum(a: number, b: number): number {
+	return a + b;
+}
+// console.log(sum(7, 2));
+
+//Tuples
+let address: [number, string, number];
+address = [111, 'bhopal', 46331];
+
+let person: { firstName: string };
+person = { firstName: 'Jojo Mike' };
+
+let anotherPerson: { firstName: string; age?: number };
+anotherPerson = { firstName: 'Nilesh', age: 21 };
+
+function add(a: string, b?: string) {
+	// optional only last parameters
+	return b ? a + b : a;
+}
+console.log(add('2', '5'));
+
+//interface
+interface Person {
+	name: string;
+	id: number;
+	age: number;
+}
+let p: Person = {
+	name: 'delta',
+	id: 34,
+	age: 34,
+};
+console.log(p);
+
+interface Student {
+	name: string;
+	rollNo: number;
+	age: number;
+}
+
+//Union
+let p1: Person | Student;
+p1 = { name: 'APJ Abdul Kalam', age: 80, id: 23 };
+p1 = { name: 'Lal Bahadur Shashtri', age: 70, id: 2 };
+console.log(p1);
+
+//InterSection
+let p2: Person & Student;
+p2 = { name: 'Sam Bahadur', id: 234, age: 96, rollNo: 1 };
+
+//Type alias
+
+type Count = string | number;
+let c: Count;
+c = 1;
+c = 'one';
+// c = false; // not assignable
+
+type X = string & number; // never
+const n: [] = []; // never array
+//n.push('hello'); // can't push it never type
+
+//classes
+
+class Car {
+	brand;
+	constructor(brand) {
+		this.brand = brand;
+	}
+	getBrand() {
+		console.log(this.brand);
+	}
+}
+let c1 = new Car('Maruti');
+c1.getBrand();
+
+//public
+class CarX {
+	constructor(public brand) {}
+	getBrand() {
+		console.log(this.brand);
+	}
+}
+let c2 = new Car('Lamborgini');
+c2.getBrand();
+console.log(c2.brand);
+
+//private
+class CarY {
+	constructor(private brand) {}
+	getBrand() {
+		console.log(this.brand);
+	}
+}
+let c3 = new CarY('Jaguar');
+c3.getBrand();
+// c3.brand
+
+
+//protected
+class CarZ {
+	constructor(protected brand) {}
+	getBrand() {
+		console.log(this.brand);
+	}
+}
+let c4 = new CarZ('Tata');
+c4.getBrand();
+// c3.brand

11_CrashCourse/index.ts

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+{
+  "name": "typescript-learn",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "typescript": "^5.5.4"
+  }
+}