[Solved] What will be the output of this Node.js code snippet?const x = 5;console.log(x + y);const y = 3; — Ans: ReferenceError: Cannot access 'y' before initialization | Node.js

Node.js - Debugging and Profiling

What will be the output of this Node.js code snippet?

const x = 5;
console.log(x + y);
const y = 3;

A8

B5undefined

CReferenceError: Cannot access 'y' before initialization

DNaN

Step-by-Step Solution

Solution:

Step 1: Understand variable hoisting with const
Variables declared with const are not hoisted like var. Accessing before declaration causes ReferenceError.
Step 2: Analyze the code execution order
console.log(x + y); runs before y is declared, causing ReferenceError.
Final Answer:
ReferenceError: Cannot access 'y' before initialization -> Option C
Quick Check:
Access const before declaration = ReferenceError [OK]

Quick Trick: const variables cannot be used before declaration [OK]

Common Mistakes:

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