| Broadcast () and Wait | |
broadcast ( v) and wait | |
| Category | Events |
| Type | Stack |
The Broadcast () and Wait block is an Events block and a stack block. The block sends a broadcast throughout the whole Scratch project. Any scripts that start with the When I Receive () block and are set to the matching broadcast will activate. This broadcast waits until all scripts activated by the broadcast end and stop running. Broadcasts are a good way to have sprites and scripts communicate.
Example Uses
If a script must be activated without a user prompt and after the project has started, there is only one way: broadcasts. Some common uses:
- Talk show animations
When I receive [Sprite1 Talk v] say [Hi, Gobo!] for (2) secs broadcast (Sprite2 Talk v) and wait say [Let's talk about food.] for (2) secs
- Ordinary animations
glide (1) secs to x: (-148) y: (80) play sound (meow v) broadcast (move v) and wait
- Waiting for an online data decoding before starting
when gf clicked broadcast (decodeCloudData v) and wait ask [enter your password to resume your progress!] and wait set [i v] to [1] repeat until <(item (i) of [users v]) = (username)> change [i v] by (1) end decrypt password::custom if <(answer) = (properPassword)> then broadcast (playGame v) else broadcast (cannotPlay v) end
- Mesh projects
set [chat v] to [1] broadcast (P2 chat v) and wait
Recursion
- Main article: Recursion
Recursion is a process where a script calls into itself. Broadcast scripts can perform a limited kind of recursion, called tail recursion, by broadcasting their own message at the end of the script, restarting the script and forming a loop.
