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Halts execution and prints a custom error message if a condition is false(0). Note that the error message will be displayed in chat even if the command itself is in a [H: ] block.
assert(condition, message)
assert(condition, message, prefix)
Parameters
condition - The test condition that must evaluate to true(1) for the macro to continue.
message - The custom error message that is presented if the macro is halted due to the false(0) condition.
prefix - Determines if the error message should have the message prefix "Macro defined error: ". Defaults to true(1), set to false(0) if you do not wish your custom error message to have the message prefix.
Checks to see if a player is a GM, and if they are not halts execution of the macro and displays output.
[h: assert(isGM(),"This macro is for GM use only.",0)]Chat output (if player is not GM): This macro is for GM use only.
Halts execution of the macro if var is a number. This is useful for making sure the variables you work with are the variable type you expect.
[h: assert(! isNumber(var), "The variable is a number.",1)]Chat output (if var is a number): Macro defined error: The variable is a number.
Bear in mind, isNumber(var) returns true(1) when var is a number, but assert continues when condition is true(1). Using ! isNumber(var) inverts the boolean value.
prefix parameter option.