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Operator Name Description Example Output

<= less than or Checks if the left operand is less than or x <= 8 true
equal to equal to the right.
=== strict equality Compares both the value and the data type x === “8” false
of two operands.

Logical Operators
The logic between variables or values is determined using logical operators. The table below
explains the logical operators given a = 6 and b = 3:

Operator Name Description Example Output
&& AND Returns true if both operands are true; false if (a < 10 && b > 1) true
either is false.

|| OR Returns false if both operands are false; true (a == 5 || b == 5) false
if any one is true.

! NOT Inverts the boolean value (true becomes !(a == b) true
false, false becomes true).

EXPRESSIONS
An expression is a meaningful combination of variables, values and operators which can be
evaluated and simplified to a single result.

For example,

area = length * breadth;

COMMENTS
Comments are instructions that are not executed by the interpreter. JavaScript code may also
include comments for the purpose of documentation and readability.

Two types of comments in JavaScript are as follows:

Single-line comment: This type of comment starts with //. For example,
// This is a single-line comment

let x = 5;

Multi-line comment: In this type of comment, text is enclosed between the characters /* and
*/. For example,

/* This is a
multi-line comment */

let y = 10;

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JavaScript for Beginners