Javascript Programs
In a programming language, computer program instructions are called statements.
JavaScript is a programming language and JavaScript statements are separated by semicolons.
Example:
var a = 1;
var b = 2;
var c = a + b;
And next is the javascript statements, and it includes
JS Values:
JS values are two types, literals (fixed values) and variables
Numbers - 10.50,100
String - with single or double quote"name"
Variables:
Variables are used to store data values. JS uses var keyword to assign variables.
Eg:
var x;
x=10;
Operators:
JS uses an assignment operator ( = ) to assign values to variables:
var a=90;
JS uses arithmetic operators ( + - * / ) to compute values:
a * 10 (expressions)
also in string level
"Mark" + " " + "Layer", evaluates to "Mark Layer":
Comments:
Code after double slashes // or between /* and */ is treated as a comment.Comments are ignored, and will not be executed:
Eg:
In a programming language, computer program instructions are called statements.
JavaScript is a programming language and JavaScript statements are separated by semicolons.
Example:
var a = 1;
var b = 2;
var c = a + b;
And next is the javascript statements, and it includes
- values
- operators
- expressions
- keywords and
- comments
JS Values:
JS values are two types, literals (fixed values) and variables
Numbers - 10.50,100
String - with single or double quote"name"
Variables:
Variables are used to store data values. JS uses var keyword to assign variables.
Eg:
var x;
x=10;
Operators:
JS uses an assignment operator ( = ) to assign values to variables:
var a=90;
JS uses arithmetic operators ( + - * / ) to compute values:
a * 10 (expressions)
also in string level
"Mark" + " " + "Layer", evaluates to "Mark Layer":
Comments:
Code after double slashes // or between /* and */ is treated as a comment.Comments are ignored, and will not be executed:
Eg:
var a = 50; // I will be executed
// var a = 50; I will
NOT be executed
JS Statements:
JS statement tells the browser to write "I am in."
inside an HTML element with id="example":
Example:
document.getElementById("example").innerHTML = "I am in.";
One program example:
var a = 5;
var b = 6;
var c = a + b;
document.getElementById("example").innerHTML =
c;
