When¶

Name	Description	Default	Type
`<input>`	The value that will be passed to the predicate.		`Any`
`<output>`	The input of the shard if `Passthrough` is `true`, or the `Predicate` is `false`; otherwise, the output of the `Action`.		`Any`
`Predicate`	The predicate to evaluate in order to trigger Action.	`None`	`Shard[ Shard ]`
`Action`	The shards to activate on when Predicate is true for When and false for WhenNot.	`None`	`Shard[ Shard ]`
`Passthrough`	The output of this shard will be its input.	`true`	`Bool`

Conditonal shard that only executes the action if the predicate is true.

Examples¶

CodeOutput

64
(When
 ;:Predicate
 (IsMore 50)
 ;:Action
 (Msg "More than 50"))

[info] [shards/General/When/When.edn] More than 50