Lesson 2 - Basic JavaScript Syntax

2.3 Basic Operators

Before we get into deeper to JavaScript, it's crucial to be familiar with the basic operators used in JavaScript coding.

The following chart introduces operators under different categories,

Category	Operator	Description	Example
Arithmetic	+	Addition	5 + 3 → 8
	-	Subtraction	5 - 3 → 2
	*	Multiplication	5 * 3 → 15
	/	Division	15 / 3 → 5
	%	Modulus (remainder)	15 % 4 → 3
Assignment	=	Assigns a value to a variable	var x = 5;
	+=	Adds the right operand to the left and assigns the result to the left operand	x += 3; → x = x + 3;
	-=	Subtracts the right operand from the left and assigns the result to the left operand	x -= 2; → x = x - 2;
	*=	Multiplies the right operand with the left and assigns the result to the left operand	x *= 3; → x = x * 3;
	/=	Divides the left operand by the right and assigns the result to the left operand	x /= 2; → x = x / 2;
	%=	Computes the modulus of the two operands and assigns the result to the left operand	x %= 3; → x = x % 3;
Comparison	==	Equality (loose equality)	5 == '5' → true
	===	Strict equality (checks both value and type)	5 === '5' → false
	!=	Inequality (loose inequality)	5 != '5' → false
	!==	Strict inequality (checks both value and type)	5 !== '5' → true
	<	Less than	5 < 3 → false
	>	Greater than	5 > 3 → true
	<=	Less than or equal to	5 <= 5 → true
	>=	Greater than or equal to	5 >= 3 → true
Logical	&&	Logical AND	(x < 10) && (y > 5)
	||	Logical OR	(x == 5) || (y == 5)
	!	Logical NOT	!(x == y)

These operators are essential for performing various operations and logic in JavaScript programming.

Now, we have a detailed list of basic operators in JavaScript. Let's see how we can use them,

let x = 8
let y = 3
if (x < 10 && y > 5) console.log("True")
else console.log("False")

In the example above, we used the logical AND operator inside the conditional statement. We discussed conditional statements in great detail later in this lesson.