Booleans

note

Anything that only works unsandboxed will be noted, but regardless, we will assume you are creating an unsandboxed extension during this tutorial.

Make a new block

Add a new object to the blocks array. This time, the blockType should be Scratch.BlockType.BOOLEAN.

Let's spice it up a bit. This block will use Math.random() to determine the output value.

[
  // our other blocks...
  {
    opcode: 'randomBoolean',
    text: 'randomness',
    blockType: Scratch.BlockType.BOOLEAN
  }
]

class Extension {
    // getInfo, other block functions...

    randomBoolean() {
        return Math.round(Math.random()) === 1;
    }
}

It'll should look something like this:

We can use disableMonitor again to remove the checkbox:

{
  opcode: 'randomBoolean',
  text: 'randomness',
  blockType: Scratch.BlockType.BOOLEAN,
  disableMonitor: true
}