The former function is for expressions, while the latter is for statements a statement cannot be part of an expression Because of this restriction, expressions such as list and dict comprehensions (and lambda expressions) cannot contain statements. Callable units provide a powerful programming tool [2] the primary purpose is to allow for the decomposition of a large and/or complicated problem into chunks that have. The ruby programming language interpreter offers an eval function similar to python or perl, and also allows a scope, or binding, to be specified Aside from specifying a function's binding, eval may also be used to evaluate an expression within a specific class definition binding or object instance binding, allowing classes to be extended with.
Apply function apply is also the name of a special function in many languages, which takes a function and a list, and uses the list as the function's own argument list, as if the function were called with the elements of the list as the arguments.
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