Whether expression for getting the result of conditions.

[Moderocky]

Description

Adds a whether %condition% expression that returns the (true/false) evaluation of the condition.
For example:

• set {_flying} to whether player is flying
• set {_alive} to whether player is alive
• send "Alive: %whether player is alive%"

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Target Minecraft Versions: any
Requirements: none
Related Issues:

• Why aren't conditions boolean expressions? #2207
• Merge conditions and expressions #3838 (would be closed in favor of this)