no-nested-switch.md

no-nested-switch

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.

Noncompliant Code Example

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

Compliant Solution

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

function bar(m) {
  switch(m) {
    // ...
  }
}