If This, Then That: Using Conditionals in Code

Every day you make decisions based on a condition. Think about this: if it is raining, you take an umbrella. If it is NOT raining, you leave the umbrella at home. Your brain checks a condition — 'Is it raining?' — and then chooses what to do. Computers do exactly the same thing! They check a condition and pick an action based on whether it is true or false.

A conditional is a special instruction that tells a computer: 'Check if something is true. If it IS true, do one thing. If it is NOT true, do something else instead.' In code, we write this using the words IF and ELSE. Here is the pattern: IF (condition is true) → do this action ELSE → do this other action The part inside the brackets is called the condition. A condition is a question that has only two answers: TRUE or FALSE. For example: • Is the score greater than 10? — TRUE or FALSE. • Is the player touching a wall? — TRUE or FALSE. If the condition is TRUE, the computer runs the first block of code (the IF block). If the condition is FALSE, the computer skips the IF block and runs the ELSE block instead. You can also use just IF on its own, without ELSE. Then, if the condition is false, the computer simply does nothing and moves on. Remember: the computer only ever follows ONE path — the IF path OR the ELSE path, never both at the same time.