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Patch
Added in 1.1.0 / 1.13.2

Determine if an action can be used (you have sufficient mana, reagents and the action is not on cooldown).

isUsable, notEnoughMana = IsUsableAction(slot)

Arguments

slot 
Number - Action slot to query

Returns

isUsable 
boolean - true if the action is currently usable (does not check cooldown or range), false otherwise.
notEnoughMana 
boolean - true if the action is unusable beacuse the player does not have enough mana, rage, etc.; false otherwise.
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