The assignment operator = is used to assign values to JS variables.
The arithmetic operator + is used to add values together.
The value of c, after the execution of the statements above is 12.
JS Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
Given that y=5, the table below explains the arithmetic operators:
Modulus (division remainder)
JS Assignment Operators
Given that x=10 and y=5, the table below explains the assignment operators:
The + Operator Used on Strings
The + operator can also be used to add string variables or text values together.
To add two or more string variables together, use the + operator.
txt1=”What a very”;
After the execution of the statements above, the variable txt3 contains “What a very nice day”.
To add a space between the two strings, insert a space into one of the strings:
|txt1=”What a very “;txt2=”nice day”;txt3=txt1+txt2;|
or insert a space into the expression:
txt1=”What a very”;
After the execution of the statements above, the variable txt3 contains:
“What a very nice day”
Example. Adding Strings and Numbers:
Look at this example:
<p>The common rule is: If you add a number and a string,
the result will be a string.</p>
The rule is: If we add a number and a string, the result will be a string.
JS Comparison Operators
JS comparison operators are used in logical statements to determine equality or difference between variables or values.
Given that x=5, the table below explains the comparison operators:
is equal to
x==8 is false
is exactly equal to (value and type)
x===5 is true
is not equal
x!=8 is true
is greater than
x>8 is false
is less than
x<8 is true
is greater than or equal to
x>=8 is false
is less than or equal to
x<=8 is true
How can it be used
Comparison operators can be used in conditional statements to compare values and take action depending on the result:
|if (age<18) document.write(“Too young”);|
JS Logical Operators
JS Logical operators are used to determine the logic between variables or values.
Given that x=6 and y=3, the table below explains the logical operators:
(x < 10 && y > 1) is true
(x==5 || y==5) is false
!(x==y) is true
JS Conditional Operator
|variable_name = (condition)?value1:value2|
|greeting = (visitor==”PRES”) ? “Dear PM” : “Dear “;|
If the variable visitor has the value of “PRES”, then the variable greeting will be assigned the value “Dear PM” else it will be assigned “Dear”.