Function choose 

pub fn choose<S: State, R: 'static, F>(f: F) -> Tree<S, F, R>
where
    F: Fn(&mut NpcCtx<'_, '_>, &mut S, &mut Consider<'_, S, R>) + Send + Sync + 'static,

An action that allows implementing a decision tree, with action prioritisation.

The inner function will be run every tick to decide on an action. When an action is chosen, it will be performed until completed UNLESS an action with a more urgent priority is chosen in a subsequent tick. choose tries to commit to actions when it can: only more urgent actions will interrupt an action that’s currently being performed.

Example

.choose_mut(|ctx| {
    if ctx.npc.is_being_attacked() {
        urgent(combat()) // If we're in danger, do something!
    } else if ctx.npc.is_hungry() {
        important(eat()) // If we're hungry, eat
    } else {
        casual(idle()) // Otherwise, do nothing
    }
})