| Yorick Language ReferenceDefining VariablesVariable names may consist of letters, numbers and the underscore _.
They have to start with a letter or the underscore. 
 var = expr     redefines var as the value
of expr
var = []      undefines var
 Any previous value or data type of var is forgotten. The expr
 can be a data type, function, file, or any other object.
 The = operator is a binary operator which has the side effect
of redefining its left operand. It associates to the right, so
 var1 = var2 = var3 = expr    
initializes all three var to expr
 LLNL Disclaimers
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