Invariant-based programming

Invariant-based programming means that when you write a program, you have to make sure that certain rules are always followed. These rules are called "invariants" and they help make sure that your program works correctly all the time.

Think of it like playing a game. When you play a game with rules, you have to follow those rules to make sure everyone is playing it fairly. The invariants in programming are like the rules of the game. If you break the rules, like moving your game piece in the wrong direction or skipping a turn, the game may not work correctly.

In programming, these rules are often things like making sure that certain values are always within a certain range or that certain things always happen in the right order. If these rules are not followed, the program can crash or give incorrect results.

It's like following a recipe to bake a cake. If you don't follow the recipe exactly, like using the wrong amount of sugar or leaving out an ingredient, the cake may not turn out the way it's supposed to. Invariant-based programming helps make sure that your program turns out the way you want it to.