Coding with Scratch

Coding means giving a computer step-by-step instructions. Let's start with Scratch. Coding, or programming, means writing instructions that a computer follows, step by step. Every app, game and website you use was made by people writing code.

New word: Algorithm

An algorithm is a list of steps to do a task. A recipe for jollof rice is an algorithm. Wash the rice, make the stew, add the rice, and cook. Computers need steps that are just as clear, in the right order.

What is Scratch?

Scratch is a free coding tool, made at M I T in America, and used by millions of children and adults around the world. Instead of typing code, you snap blocks together like puzzle pieces. You can make games, animations, stories and greeting cards. It runs in a web browser at scratch dot M I T dot E D U, and works best on a computer or tablet.

Your first program

Here's a tiny program. It starts with a yellow hat block, when green flag clicked. That's how the program begins. Next, move ten steps. The character, called a sprite, moves a little to the right. Then, say hello for two seconds. A speech bubble appears.

Getting started

To try it, go to scratch dot M I T dot E D U. Click Create to open the editor. Drag blocks from the left into the middle, and snap them together. Then click the green flag to run your program. You can make an account to save your work. If you're under sixteen, you'll need a parent's email address.

Quick check

Quick check. What is an algorithm? A list of steps to do a task, in the right order. Options: A list of steps to do a task; A type of computer virus; A phone brand; A kind of dance.

Recap

Coding is writing step by step instructions for a computer. An algorithm is a list of steps. Scratch uses blocks that snap together. And the green flag runs your program.

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