Control flow statements direct the flow of execution from one block to another:

• if .. elif .. else. Choose which block to execute based on evaluating one or more conditional expressions.
• pattern matching. Choose which block to execute based on which pattern first matches some value
• while or loop. Repeatedly execute some block while certain conditional expressions are true.
• each iteration. Repeatedly perform some block for each every value in some iterated sequence.
• exception handling. Support different control flows for successful processing vs. thrown exceptions.