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Idiom #131 Successive conditions

Execute f1 if condition c1 is true, or else f2 if condition c2 is true, or else f3 if condition c3 is true.
Don't evaluate a condition when a previous condition was true.

if      (c1) f1;
else if (c2) f2;
else if (c3) f3;
switch {
case c1:
	f1()
case c2:
	f2()
case c3:
	f3()
}
if c1 then f1
else if c2 then f2
else f3
if c1 then f1 else if c2 then f2 else if c3 then f3;
if ($c1)    { $f1 }
elsif ($c2) { $f2 }
elsif ($c3) { $f3 }
f1 if c1 else f2 if c2 else f3 if c3 else None
case
  when c1
    f1
  when c2
    f2
  when c3
    f3
end
if c1 { f1 } else if c2 { f2 } else if c3 { f3 }
(cond (c1 (f1))
      (c2 (f2))
      (c3 (f3)))

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