[vc_row][vc_column][nz_btn text=”Production Risk” link=”http://casthighlight.wpengine.com/category/product/indicators-methodology/risk/” target=”_self” icon=”icon-office” animate=”false” animation_type=”ghost” color=”pink” size=”small” shape=”rounded” type=”normal” hover_normal=”opacity” hover_ghost=”fill”][nz_btn text=”Software Resiliency” link=”http://casthighlight.wpengine.com/software-resiliency/” target=”_self” animate=”false” animation_type=”ghost” color=”black” size=”medium” shape=”rounded” type=”normal” hover_normal=”fill” hover_ghost=”fill” icon=”icon-dashboard”][nz_btn text=”Code Reliability” target=”_self” animate=”false” animation_type=”ghost” color=”black” size=”small” shape=”rounded” type=”ghost” hover_normal=”fill” hover_ghost=”screen” link=”http://casthighlight.wpengine.com/category/product/indicators-methodology/code-insights/software-resiliency/code-reliability/” icon=”icon-code”][vc_empty_space height=”12px”][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]

Empty and Implicit Returns cause resiliency issues.

[/vc_column_text][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]This code insight

Counts one violation each time a function has at least one significant return (expression different from nothing, none or false) and in the same time :

•  at least one empty return
  OR
• an implicit return in place of the last statement.

bad

def foo(x):
if x >= 0:
return math.sqrt(x)
# <— implicit return here

def bar(x):
if x < 0:
return # <—- empty return here
return math.sqrt(x)

good

def foo(x):
if x >= 0:
return math.sqrt(x)
else:
return Nonedef bar(x):
if x < 0:
return None
return math.sqrt(x)[/vc_column_text][vc_empty_space height=”12px”][vc_empty_space height=”32px”][vc_single_image image=”5362″ img_link_large=”” img_link_target=”_self” img_size=”full” alignment=”none”][vc_row_inner][vc_column_inner width=”1/2″][vc_column_text pl=”0″ pr=”0″ pt=”0″ pb=”0″]

Why you should care

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Be consistent in return statements. Either all return statements in a function should return an expression, or none of them should. If any return statement returns an expression, any return statements where no value is returned should explicitly state this as return None , and an explicit return statement should be present at the end of the function (if reachable).

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Business Impacts

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CAST recommendations

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References

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