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Strong Typing

Fabl is a strongly typed language, unlike JavaScript. Not only are variables and functions assigned types when they are defined, but every Fabl expression has a type, and types are checked when Fabl analyzes source code. So, for example:

boolean function example(int x)
{
  var boolean b;
  b = x+1;
  return b;
}

yields an error at the line b = x+1;, because the type of b does not match the type of x+1. Note that the error occurs when Fabl analyzes the definition of the function ("compile time"), not at run time.