Eliminate duplicate code in nested IFs without creating a function [duplicate]

Question

Let's say we have two ifs that depend on each other:

if var exists {
    if var is array {
        //Do stuff with var
    } else {
        //Resolve the problem
    }
} else {
    //Resolve the problem in the exact same way as above
}
//Continue execution with the assumption that var is in the appropriate state

How can I refactor this to remove the duplicated code without using gotos or functions/methods?

Answer 1

Am I missing something more complicated here, or shouldn't this just be:

if var exists and var is array {
    //Do stuff with var
} else {
    //Resolve the problem
}

//Continue execution with the assumption that var is in the appropriate state

The check for if var exists will short-circuit and fall through to the else resolution block if it evaluates to false.

Answer 2

If you don't mind "do stuff with var" runs every time:

if var does not exist {
    //Resolve the problem
}

if var is array {
    //Do stuff with var
} 
//Continue execution with the assumption that var is in the appropriate state

If you don't want "do stuff with var" to run every time (as in original code):

if var does not exist {
    //Resolve the problem
    flag = true
}

if var is array && flag == true {
    //Do stuff with var
} 
//Continue execution with the assumption that var is in the appropriate state

Answer 3

Assuming the tests cannot be joined in one expression I would write:

bool ok = false;
if var exists {
    if var is array {
        //Do stuff with var
        ok = true;
    }
}
if (!ok) {
    //Resolve the problem
}
//Continue execution with the assumption that var is in the appropriate state