Operators are simply some functions having a arithmatic, logical or bitwise property. To start with, we will to through arithmetic operators first as we know maths.
We are quite familiar with some of the operators but we’ll learn each on in detail.
var num1 = 10; var num2 = 20; var total = num1+num2; //total = 20
Here, total will hold the value of sum of the numbers.
var num1 = 10; var num2 = 20; var total = num1-num2; //total = -10
Here, total will hold the value of difference of the numbers, with sign, (-) in this case.
var num1 = 10; var num2 = 20; var total = num1*num2; //total = 200
Here, total will hold the value of multiplication of the numbers.
var num1 = 10; var num2 = 20; var total = num1/num2; //total = 0.5
Here, total will hold the value of quotient. 0.5 in this case.
var num1 = 10; var num2 = 20; var total = num1%num2; //total = 10
Here, total will hold the value of remainder.10 in this case.
var num1 = 10; var num2; var num2 = num1; //num2 = num1 = 10
Here, num2 will hold the value of num1. The assignment is done from right to left hand side. Simple Maths, isn’t it.
var num = 10; var total = num++; //total = 11 var total = num+=4; //total = 11+4 = 15
Increment operator is just like addition, but used when you need to add a numeric value to the variable itself.
var num = 10; var total = num--; //total = 9 var total = num-=2; //total = 9-2 = 7
Increment operator is just like substraction, but used when you need to substract a numeric value from the variable.
Note – You can also use increment/decrement with mulitiplication, division and modulus operators as well. Try this in the browser.
Unlike arithmatic operators, + is the only operator which is used to concatinate 2 or more strings together.
var first = "Fname"; var last = "Lname"; var name = first + " " + last; //Fname Lname
var first = "Fname"; var name +=" Lname"; //Fname Lname var name = first + " Lname"; //Fname Lname
String and Numbers
var number = 10; var name = 'Name'; var result = number+name; //10name result = name+number; //name10
|!=||Not Equal to|
|===||Equal to and equal type|
|!==||Equal to not equal type|
|>=||Greater than equal to|
|<=||Less than equal to|
We will go through these operators in more details in the next section when we will cover conditional statements.