Any statement (other than a null statement, which means a statement containing only a semicolon ;) which has no side effect and does not result in a change of control flow will normally indicate a programming error, and therefore should be refactored.

Noncompliant Code Example

a == 1; // Noncompliant; was assignment intended?
var msg = "Hello, "
  "World!"; // Noncompliant; have we forgotten '+' operator on previous line?

See