Question

for example…

if ( /* Condition */ ) {

    if ( /* Condition */ ) {

        if ( /* Condition */ ) {

          // Superb!

        } else {

          // Error 3

        }

    } else {

      // Error 2

    }

} else {

  // Error 1

}

Do you know how to avoid this? Thank you!

Answer 1

If this is a library function, throw may be the appropriate action.

if (!condition1) {
    throw "Condition 1 failed.";
}

if (!condition2) {
    throw "Condition 2 failed.";
}

if (!condition3) {
    throw "Condition 3 failed.";
}

// Superb!

Other acceptable actions might be:

• Returning 0, null, or undefined.
• Displaying an error to the user and returning.

You will have to determine which failure action is right for your use case.