concept loop in category scratch

This is an excerpt from Manning's book Hello Scratch!: Learn to program by making arcade games. Login to get full access to this book.

Making loops

Sometimes you want an action to happen once. Other times you want the action to happen over and over again. A loop is used when you want a piece of code to run until either a condition is met or the red stop sign above the Stage is clicked. For instance, you could make your cat spin round and round, as in figure 3.16, just by putting the blue Motion block inside the yellow Forever block.

Figure 5.5. The second If/Then block is also placed inside the Forever block, adding to the loop.