Mastering Operator Precedence in JavaScript – TCS Interview Code Explained

Our Javascript Code:

console.log(10+2*3);

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Step-by-Step Breakdown

Step 1: Understand the Operators

You're using two arithmetic operators:

Operator	Description	Precedence	Associativity
*	Multiplication	Higher than +	Left-to-right
+	Addition	Lower than *	Left-to-right

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Step 2: Apply Operator Precedence

JavaScript looks at the operator precedence and starts with the higher one.

Expression:

10 + 2 * 3

First, multiplication (*) has higher precedence than addition (+), so:

2 * 3 = 6

Now the expression becomes:

10 + 6 = 16

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✔ Final Answer:

A) 16

This question appeared in the TCS (Tata Consultancy Services) interview, testing the candidate’s knowledge of operator precedence  in JavaScript.

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Remember key Concept: Operator Precedence

JavaScript follows a strict order of operations just like in math (remember PEMDAS?):

Parentheses
Exponents
Multiplication
Division
Addition
Subtraction

So in this case:

• Multiplication happens first (2 * 3 = 6)
• Then addition happens (10 + 6 = 16)