Small Ideas That Solve Real Problems

Deep nesting of if/else blocks makes code hard to follow — 3+ levels of indentation is a code smell.

Return early for edge cases and errors at the top of your function. The main logic stays flat at the base level.

Reduces nesting from 3-4 levels to 0-1. Each condition is handled and exited immediately — much easier to read.

The 9 times table is one of the hardest to memorize, especially for students and anyone doing quick mental math.

Hold up 10 fingers. To multiply 9 × N, fold down finger #N. Fingers to the left = tens digit, fingers to the right = ones digit.

Never memorize the 9 times table again — works for 9×1 through 9×10 with 100% accuracy using your hands.

Messages like "Fix bug" or "Update file" are useless 6 months later when you need to understand what changed and why.

Write commit messages that explain the reason for the change. The diff shows WHAT changed — the message should explain WHY.

Makes git blame and git log actually useful. Your team (and future you) will thank you during debugging.

Multiplying large numbers by 5 in your head can be slow, especially with odd numbers.

Divide the number by 2, then multiply by 10. If the number is odd, divide by 2 and you will get a .5 — just move the decimal.

Dividing by 2 is always easier than multiplying by 5 — works for any number, any size.