Expression and Precedence

Class:BCOM IIyr

Subject:WebDesigning

Subject Type:OEL

Asst Prof.Manju Kumawat

1. Expression 

An expression in JavaScript is a combination of values, variables, and operators that is evaluated to produce a single value.

Example

5 + 3  

Explanation:
This expression evaluates to 8.

Another example:

let result = x > 10;  

Here, x > 10 is an expression that produces true or false.

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2. Operator Precedence 

Operator precedence is the rule that determines which operator is evaluated first when an expression contains more than one operator.

Example

let value = 10 + 5 * 2;  

Explanation:
Multiplication (*) has higher precedence than addition (+), so:

10 + (5 * 2) = 20  

Using parentheses:

let value = (10 + 5) * 2;  

Now the result is:

30