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🎯 Copy-Paste Ready Interview Code Snippets

✅ VERIFIED WORKING - Use These!

JavaScript Snippets

1. Math Functions (YOUR ORIGINAL CODE - FIXED)

function add(a, b) {
  return a + b;
}

function subtract(a, b) {
  return a - b;
}

// Using hardcoded values (not prompt - which is browser-only)
const num1 = 15;
const num2 = 7;

console.log("Addition:", add(num1, num2));
console.log("Subtraction:", subtract(num1, num2));

Output: Addition: 22 Subtraction: 8 ✅

2. Array Operations

const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((a, b) => a + b, 0);
const avg = sum / numbers.length;
const doubled = numbers.map(n => n * 2);

console.log("Array:", numbers);
console.log("Sum:", sum);
console.log("Avg:", avg);
console.log("Doubled:", doubled);

Output: Sum: 15, Avg: 3, Doubled: [2,4,6,8,10] ✅

3. Recursion - Factorial

function factorial(n) {
  if (n <= 1) return 1;
  return n * factorial(n - 1);
}

for (let i = 1; i <= 5; i++) {
  console.log(`${i}! = ${factorial(i)}`);
}

Output:

1! = 1
2! = 2
3! = 6
4! = 24
5! = 120

✅

4. Fibonacci Sequence

function fib(n) {
  if (n <= 1) return n;
  return fib(n - 1) + fib(n - 2);
}

console.log("Fibonacci sequence:");
for (let i = 0; i < 10; i++) {
  console.log(`fib(${i}) = ${fib(i)}`);
}

Output: fib(0)=0, fib(1)=1, fib(2)=1, fib(3)=2... ✅

5. Object Methods

const calculator = {
  add: (a, b) => a + b,
  subtract: (a, b) => a - b,
  multiply: (a, b) => a * b,
  divide: (a, b) => a / b
};

console.log("10 + 5 =", calculator.add(10, 5));
console.log("10 - 5 =", calculator.subtract(10, 5));
console.log("10 * 5 =", calculator.multiply(10, 5));
console.log("10 / 5 =", calculator.divide(10, 5));

Output: 15, 5, 50, 2 ✅

Python Snippets

1. Math Functions

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

num1 = 15
num2 = 7

print(f"Addition: {add(num1, num2)}")
print(f"Subtraction: {subtract(num1, num2)}")

Output: Addition: 22 Subtraction: 8 ✅

2. List Operations

numbers = [1, 2, 3, 4, 5]
total = sum(numbers)
avg = total / len(numbers)
squared = [n**2 for n in numbers]

print(f"List: {numbers}")
print(f"Sum: {total}")
print(f"Avg: {avg}")
print(f"Squared: {squared}")

Output: Sum: 15, Avg: 3.0, Squared: [1,4,9,16,25] ✅

3. Recursion - Factorial

def factorial(n):
    if n <= 1:
        return 1
    return n * factorial(n - 1)

print("Factorial sequence:")
for i in range(1, 6):
    print(f"{i}! = {factorial(i)}")

Output:

1! = 1
2! = 2
3! = 6
4! = 24
5! = 120

✅

4. Dictionary Operations

student = {
    "name": "Alice",
    "math": 95,
    "science": 87,
    "english": 92
}

avg_score = sum(student[k] for k in ["math", "science", "english"]) / 3

print(f"Student: {student['name']}")
print(f"Subjects: {', '.join([k for k in student if k != 'name'])}")
print(f"Average Score: {avg_score:.1f}")

Output: Alice's average: 91.3 ✅

5. Using Libraries (math)

import math

print("Math Library Examples:")
print(f"sqrt(16) = {math.sqrt(16)}")
print(f"factorial(5) = {math.factorial(5)}")
print(f"sin(π/2) = {math.sin(math.pi/2)}")
print(f"cos(0) = {math.cos(0)}")
print(f"floor(3.7) = {math.floor(3.7)}")
print(f"ceil(3.2) = {math.ceil(3.2)}")

Output: sqrt: 4.0, factorial: 120, sin: 1.0, cos: 1.0... ✅

⚠️ Things to AVOID

❌ DON'T USE - Browser-only features:

// DON'T: prompt() - Not available in Node.js
let num = Number(prompt("Enter number:"));

// DO: Use hardcoded values
let num = 42;

❌ DON'T USE - Python input():

# DON'T: User input - blocks execution
num = int(input("Enter number: "))

# DO: Hardcoded values
num = 42

❌ DON'T USE - C++ (compiler not available):

// DON'T: Will show error
#include <iostream>
int main() { ... }

// DO: Use JavaScript or Python instead

🚀 How to Use in Interview

  1. Open room in CollabCode
  2. Set language to "JavaScript" or "Python" (dropdown)
  3. Copy one of the snippets above
  4. Paste into editor
  5. Click "Run Code"
  6. Show output to interviewer

🎯 Interview Talking Points

"This code executes in real-time on the backend"

  • Show code → Click Run → See output appear
  • Mention: Node.js child_process spawning

"Real-time collaboration is happening"

  • Open URL in 2 tabs
  • Type in one tab → See it sync in other
  • Explain: Yjs CRDT + Socket.IO

"Supports multiple languages"

  • Switch to Python
  • Run Python code
  • Show it works

All snippets tested and verified ✅