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Why you should care

[/vc_column_text][vc_column_text]Nested switch structures are difficult to understand because you can easily confuse the cases of an inner switch as belonging to an outer statement. Therefore nested switch statements should be avoided.

Specifically, you should structure your code to avoid the need for nested switch statements, but if you cannot, then consider moving the inner switch to another function.[/vc_column_text][vc_empty_space][/vc_column_inner][/vc_row_inner][vc_empty_space height=”12px”][vc_empty_space][vc_separator][vc_column_text]

How we detect

[/vc_column_text][vc_column_text]CAST Highlight counts one occurrence each time a nested switch is encountered.

Bad Code

switch (n) {
case 0:
switch (m) { // Noncompliant; nested switch
case 0:
// ...
case 1:
switch (o) { // Noncompliant; nested switch

case 0:
switch (p) { // Noncompliant; nested switch
//...
}

default:
// ...
}
}
case 1:
switch (o) { // Noncompliant; nested switch
default:
// ...
}
default:
// ...
}

Good Code

function foo(n: number, m: number) {
  switch (n) {
    case 0:
      bar(m);
    case 1:
      // ...
    default:
      // ...
  }
}
 
function bar(m: number) {
  switch(m) {
    // ...
  }
}

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References

[/vc_column_text][vc_column_text]https://stackoverflow.com/questions/15931089/alternative-to-nested-switch-statements-in-java
https://www.fluentcpp.com/2017/06/27/how-to-collapse-nested-switch-statements/
https://stackoverflow.com/questions/14827914/is-there-any-design-pattern-to-avoid-a-nested-switch-case
https://rules.sonarsource.com/java/RSPEC-1821[/vc_column_text][vc_empty_space][vc_row_inner][vc_column_inner][vc_single_image image=”5362″ img_size=”full”][vc_column_text]

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