if False
evaluates a block if the receiver is boolean false value, this is smalltalk's way of unless statement.
Parameters
<receiver>
Boolean
block
block of code to execute if false
evaluates first block if the receiver is boolean false value, otherwise evaluates the second block, this is smalltalk's way of unless...else statement.
Parameters
<receiver>
Boolean
block
block of code to execute if false
ifTrue
block of code to execute if true