Example of JavaScript.
The variables a,b , and c are assigned the values 50, 60, and 110:
``` **Note:**JavaScript statements are separated by semicolon. JavaScript statements are composed of operators, value, expression, comments and keywords. **JavaScript values** The javascript has [two variables](https://www.mindstick.com/forum/236/how-can-i-swap-two-variables-without-using-a-third-variable): Fixed value and [variable values](https://www.mindstick.com/forum/157371/swap-two-integers-variable-values-without-using-the-third-variable). Fixed values are also [known as](https://answers.mindstick.com/qa/35703/ricky-ponting-is-also-known-as-what) literals. **JavaScript Literals** The necessary rules for writing fixed values are: **Numbers** can be written with or without decimals.for example: // literals can be with floating point or without. 12 12.32\ Strings are text, written within single quotes or double quotes: \ “Rachel”‘Rachel’ **JavaScript Variables** In any programming language, **variables** are used to **store** record. JavaScript programming language uses the var keyword to declare variables. An equal sign is used to assign data to variables. In this below example, a is a variable. Then, a is assigned the value 6: var a ;a=6;\ **JavaScript Operators** JavaScript programming language uses an **assignment operator ( = )** to assign record to variables: ``` ``` JavaScript programming language uses [arithmetic operators](https://www.mindstick.com/forum/157625/what-is-meant-by-arithmetic-operators-in-python) ( + - * / ) to calculate values: \ ``` ``` **JavaScript Expressions** An expression is a combination of variables, values, and operators, which calculate the records. The process called an **evaluation**. Following is an example: ``` ``` ##### JavaScript Keywords JavaScript **keywords** identify actions to be performed. The var keyword is used to create a new variable: ``` ``` ##### JavaScript Comments Code written after double slashes // or code between /* and */ is treated as a comment. These comments are ignored, and will not be executed: **JavaScript is Case Sensitive** All JavaScript are **case sensitive** which means variables var Name and var name, are two different variables. **JavaScript DataTypes** Data types one of the most important characteristics of a programming language. These are the type of data which is used to represent and manipulate in a programming language. There are three types of data types in JavaScrip − - Numbers, eg. 2123, 1220.250 etc. - Strings of text e.g. "This is my first JavaScript program" etc. - Boolean e.g. [true or false](https://www.mindstick.com/forum/160329/how-can-you-convert-a-value-to-a-boolean-true-or-false-in-javascript). Two trivial data types, null and **undefined** are also defined in JavaScript which defines only single value. JavaScript also supports a composite data type known as object. We will discuss objects in detail in next article. --- Original Source: https://www.mindstick.com/blog/11171/javascript-introduction Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.