Why is this an issue?

Unreachable code is the code whose statements cannot be executed under any circumstances. Jump statements, like return, break, continue, and throw, alter the normal flow of control within a program, making it possible to skip certain parts of the code, terminate loops prematurely, or exit from functions. So any statements that come after a jump are effectively unreachable.

Unreachable statements can be a sign of a logical error or oversight in the program’s design, leading to unexpected behavior at runtime.

function func(a) {
  let i = 10;
  return i + a;
  i++; // Noncompliant: this is never executed
}

Identify and remove unreachable statements from your code.

function func(a) {
  let i = 10;
  return i + a;
}

Resources

Documentation

• MDN web docs - return
• MDN web docs - break
• MDN web docs - throw
• MDN web docs - continue
• MDN web docs - Warning: unreachable code after return statement