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The list of keywords is as follows:
await break case catch class
const continue debugger default delete
do else export extends finally
for function if import in
instanceof new return super switch
this throw try typeof var
void while with yield
Comments
A comment is used to add notes in your code or to disable sections of code without deleting them. Comments
are ignored by the JavaScript interpreter. There are two types of comments in JavaScript: single line and multi-
line. Single line comments are added by using // and multi-line comments are added by using /* and */.
For example:
// alert("Hello"); Single line comment
/* a = 10;
b = 20; Multiline comment
*/
Operators
Operators are special symbols that are used to perform mathematical, logical, and relational operations
on values and variables. The variables or values on which the operators work are called operands. Some
commonly used operators in JavaScript are arithmetic operators, assignment operators or shorthand
assignment operators, comparison operators, logical operators, etc.
Arithmetic Operators
Arithmetic operators are used to perform mathematical operations on numbers in JavaScript. JavaScript
provides the following arithmetic operators:
Operator Name Description Example Output
(a = 11, b = 4)
+ Addition Adds two operands. a + b 15
– Subtraction Subtracts the operand written on the right-hand side of a – b 7
the operator from the operand written on the left side.
* Multiplication Multiplies both operands. a * b 44
/ Division Divides numerator by denominator. a / b 2.75
% Modulus Divides numerator by denominator and returns the remainder. a % b 3
** Exponent Calculates the base to the exponent power, that is base^ b**2 16
exponent
++ Increment Used to increase the value of a variable by 1. ++a 12
-- Decrement Used to decrease the value of a variable by 1. --a 10
190 Touchpad Web Applications (Ver. 2.0)-XII

