30 JavaScript practice questions focused purely on if, else if, and else (perfect for coding practice & interviews

🟢 Beginner Programs (1–10)

1. Write a program to check if a number is positive, negative, or zero.
2. Write a program to check if a number is even or odd.
3. Write a program to check if a person is eligible to vote (age ≥ 18).
4. Write a program to check if a number is greater than 100.
5. Write a program to check if a year is a leap year.
6. Write a program to check if a character is a vowel or consonant.
7. Write a program to check if a number is divisible by 5.
8. Write a program to find the maximum of two numbers.
9. Write a program to find the minimum of three numbers.
10. Write a program to check whether a number is a multiple of both 3 and 7.

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🟡 Intermediate Programs (11–20)

11. Write a program to calculate grade based on marks.
12. Write a program to check whether a character is uppercase or lowercase.
13. Write a program to check if a number is a 3-digit number.
14. Write a program to check whether a triangle is valid.
15. Write a program to check the type of triangle (equilateral, isosceles, scalene).
16. Write a program to check whether a number is a palindrome.
17. Write a program to check whether a number is an Armstrong number.
18. Write a program to calculate electricity bill using slab rates.
19. Write a program to check if a user can login (username & password match).
20. Write a program to check whether a number is divisible by 2, 3, or both.

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🔴 Advanced Programs (21–30)

21. Write a program to check if a number is prime.
22. Write a program to calculate bonus based on salary and experience.
23. Write a program to check whether a date is valid.
24. Write a program to check whether a number is positive even, positive odd, or negative.
25. Write a program to calculate income tax based on salary slabs.
26. Write a program to check whether a character is a digit, alphabet, or special character.
27. Write a program to check whether a number is divisible by 4 but not by 6.
28. Write a program to check password strength using conditions.
29. Write a program to determine the day of the week using number (1–7).
30. Write a program to check whether a number is perfect or not.