Introduction to JavaScript

Strings 2/5

String length:

We use the length property to check the length of the string.

console.log(`JavaScript`.length );


              1
            
console.log(`JavaScript`.length );

Compito

Swipe to start coding

The task is to create a string variable named running and assign the value The horse runs so fast to it. Now check the length or number of characters in the above variable.

Soluzione

let running ="The horse runs so fast";

console.log(running.length);

Note: length property also considers the spaces between the string length.

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Sezione 3. Capitolo 20

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Introduction to JavaScript

1. Introduction

Writing our first code on JavaScript.

Writing our first code

Output Using Variables 1/2

Output Using Variables 2/2

2. JavaScript syntax

The syntax of the JavaScript programming language is the set of rules that defines how a JavaScript program will be written and interpreted (by both the runtime system and by human readers).

JavaScript Syntax

JavaScript Variables

JavaScript Operators

Identifiers in JavaScript

Naming Identifiers

Reserved keywords in JavaScript

Naming Convention in JavaScript. Case Styles

Variables Naming Convention

Boolean Naming Convention

Constant Naming Convention

Function & Classes Naming Convention

Multiline Strings

Multiline Strings. Concatenating

Commenting in JavaScript

Commenting in JavaScript. Multi-line Comments

3. Data Types and Variables

JavaScript is dynamically typed (also called loosely typed) scripting language. That is, in javascript variables can receive different data types over time. Datatypes are basically typed of data that can be used and manipulated in a program.