Introduction to Javascript

INTRODUCTION

This language is the popular language in web developments.
javascript is mainly used to decide how web pages will behave.

Syntax

• statements are separated using semicolon (;)
  example
  x= 5;
y=3;
let a =x+y ;


• comments doesn't allow execution of unnessary statements. they are shown with (//)
  examples

1. variables in Javascript variables are containers for storing data or data values. ways to declare variable include;

• using the keyword var commonly used and it does not have the restrictions that other keywords have.
  • using the keyword let used for declaration of block-level variables.
  • using the keyword const used for declaration variables whose values are might change
  • using nothing

1. Data types of Javascript

• String- the data type is mainly used to represent textual data and is created using single or double quotes surrounding one or more characters. example

• Number - used to represent positive or negative numbers with or without decimal place, or numbers written using exponential notation

• Boolean- the data type can hold only two values: true or false. The Boolean values also come as a result of comparisons in a program.

• Object- they are variables which contain more than one value example of a person as shown.