03 Basics

Define a variable and display at console

let name = "Ram"; console.log(name);

Define data types

1. let first:number = 123; // number
2. let second: number = 0x37CF; // hexadecimal
3. let third:number=0o377 ; // octal
4. let fourth: number = 0b111001;// binary
5. let uname:string = "Hello Ram"; //String
6. let lname:string = "How are You?"; //String

Define constant

• const VAR = 10;
• console.log("Value is: " +VAR);

Arrays and Tuples

Arrays

• let arr:number[]; //
• arr = [1, 2, 3, 4];
• console.log(arr[0]);
• console.log(arr[1]);

Tuples

• let arrTuple = [1, "Ram", 2, "Shyam"];
• console.log(arrTuple.length);
• console.log(arrTuple);
• console.log(arrTuple[0]);
• console.log(arrTuple[1]);
• console.log(arrTuple.pop()); // Remove an element
• arrTuple.push("Python"); // Add an element
• console.log(arrTuple.length);