JS1 ClassNotes PDF

What is JavaScript? JS is a programming language. We use it to give instructions to the computer. lege Col a Input (code) Computer Output Apn...

What is JavaScript? JS is a programming language. We use it to give instructions to the computer. lege Col a Input (code) Computer Output Apn use console in any browser or just open one of your projects and use that the code is not permanent, we can use the up & down arrow to bring back old code Setting up VS Code It is a free & popular code editor by Microsoft lege Col pna A we'll use the chrome developer tools console to write our code but not for long terms as afterwards we will start to use js file like we used for css Our 1st JS Code Console.log is used to log (print) a message to the console lege Col console.log(“Apna College”); pna A Variables in JS Variables are containers for data lege Col na radius 14 Ap memory Variable Rules Variable names are case sensitive; “a” & “A” is different. lege l Only letters, digits, underscore( _ ) and $ is allowed. (not even space) a Co Only a letter, underscore( _ ) or $ should be 1st character. Apn Reserved words cannot be variable names. let, const & var var : Variable can be re-declared & updated. A global scope variable. lege ol let : Variable cannot be re-declared but can be updated. A block scope variable. C pna A const : Variable cannot be re-declared or updated. A block scope variable. Data Types in JS Primitive Types : Number, String, Boolean, Undefined, Null, BigInt, Symbol lege Col pna A  ge String ol le a C Number Follow Apn Boolean Let‘s Practice Qs1. Create a const object called “product” to store information shown in the picture. lege Col pna A Let‘s Practice Qs2. Create a const object called “profile” to store information shown in the picture. lege Col pna A