Javascript operators

7/20/2015
Presented by:- Ms. Deepti Tara, Assoc. Prof.,
UIC, CU
1
Operators in JavaScript

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Contents
• Introduction to Operators
• Various Categories of Operators
• Usage of various Operators in Scripts

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Operators
• An operator is used to transform one or more values into a
single resultant value.
• The value to which the operator is applied is referred as
operands.
• A combination of an operator and its operands is referred to
as an expression.

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Arithmetic
Comparison
StringConditional
Assignment

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Arithmetic Operators
• Arithmetic operators are the most familiar operators
because they are used every day to solve common math
calculations
+ Addition
- Subtraction
* Multiplication
/ Division
% Modulous (Remainder after
division)

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Arithmetic Operators
++ increment operator
_ _ decrement operator

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<html>
<head> <title>Arithmetic Operators</title</head>
<body>
<script language="javascript">
a=20;b=3;
document.write("sum="+(a+b));
document.write("<br> remainder="+(a%b));
document.write("<br> increment="+(++a));
document.write("<br> decrement="+(--b)); </script>
</body>
</html>

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Comparison Operators
• Comparision operators are used to compare two
values.
== Equal
!= Not equal
< = Less than or equal to
>= Greater than or equal to
==== Strictly equal
!== Strictly not equal

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Continued..
• The equal(==) and not equal to (!=) operators
perform type casting for equality. For e.g. “5” ==
5 evaluate to true.
• The strictly equal(===) and strictly not equal to
(!==) operators perform type casting for equality.
For e.g. “5” === 5 evaluate
to false.

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<html>
<head><title>Comparison Operator</title>
</head>
<body> <script language="javascript">
document.write("[5>6]->" + (5>6));
document.write("<br>[10<=15]->" + (10<=15));
document.write("<br>[4==6]->" + (4==6));
document.write("<br>[7!=8]->"+(7!=8));
</script>
</body>
</html>

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String Operators
• String operators are those operators that are used to
perform operations on strings.
• Currently, JavaScript supports only the string
concatenation (+) operator.
• This operator is used to join two strings. For e.g.,
“pq” + “ab” produces “pqab”.

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<html>
<head><title>String Operator</title>
</head>
<body>
var c=3+5+"6";
var d=c;
document.write("hello"+"world");
document.write("<br>"+ 3 + "6");
document.write("<br>"+ 3 + 5 +"6");
document.write("<br>result =" +d);
</script> </body></html>

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Assignment Operators
• The assignment operator is used to update the value
of a variable.
• Some assignment operators are combined with
other operators to perform a computation on the
value contained in a update the variable with the
new value.

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Assignment Operators….
= sets the variable on the left of
the = operator to the value of
the expression on its right.
+= increments the variable on the
left of the += operator of the
expression on its right.
-= decrements the variable on the
left of the -= operator of the

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Assignment Operators….
*= multiplies the variable on the
left of the *= operator to the
value of the expression on its
right.
/= divides the variable on the
left of the /= operator of the

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<html>
<head><title>Assignment Operator
</title></head>
<body>
<script language="javascript"> a=3; b=6;
document.write("[a+=6]->"+(a+=6));
document.write("<br>[b*=5]->"+(b*=5)); </script>
</body>
</html>

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Conditional Operators
• JavaScript supports the conditional expression
operator.
• They are ? And :
• The conditional expression operator is a ternary
operator since it takes three operands, a condition to
be evaluated and two alternative values to be
returned based on truth and falsity of a condition

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Conditional Operators….
Syntax:
Condition ? Value1:value2
The condition expressed must return a value true or
false. If the condition is true, value 1 is the result of
the expression, otherwise value 2 is the result of the
expression

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<html>
<head><title>Conditional Operator
</title></head>
<body>
a=8;b=6;
c=a>b?a:b;
document.write(c+"is greater");
</script>
</body>
</html>

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