Your first program आपका पहला प्रोग्राम

1. Talking to the console

A program is a list of instructions that the computer follows from top to bottom. console.log(...) prints a message in the console, so you can see what your code is doing.

A variable is a labelled box that stores a value. Make one with let:

• let city = "Pune"; puts the text Pune in a box called city
• console.log(city); prints Pune

Text always goes inside quotes. Join pieces of text with +.

                let city = "Pune";
console.log("Namaste from " + city);
              

Challenge: Say namaste

Create a variable name with your name, then print Namaste, followed by the name, e.g. Namaste, Asha.

2. let or const?

Use let for a value that will change, and const for a value that stays the same.

• const shop = "Sharma Tea Stall"; — the shop name never changes
• let cups = 12; and later cups = cups + 5; — the count of cups changes

Notice: when you change a let variable you write its name without let again. If you try to change a const, JavaScript stops with an error.

Good habit: start with const, and switch to let only when the value must change.

                const shop = "Sharma Tea Stall";
let cups = 12;
cups = cups + 5;
console.log(shop, "sold", cups, "cups");
              

Challenge: The chai stall

Make a const called shopName with your stall’s name. Make a let called cups that starts at 12. Then 5 more cups are sold: add 5 to cups. Finally print cups (it should show 17).