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Tips for cleaner code: Cleaning up IF statements
Tips for cleaner code: Cleaning up IF statements

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Tips for cleaner code: Cleaning up IF statements.

if code.

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49 thoughts on “Tips for cleaner code: Cleaning up IF statements | สรุปข้อมูลif codeล่าสุด

  1. Nathan Dickson says:

    It's probably better to not return from within if statements as it breaks the block structure of the code. I used to do it and then learned not to. It's better to assign the result of the concatenation in your first example to a variable, replacing a null definition, then returning that at the end:

    {
    var a = 0;
    if (something)
    var a = 1;
    return a
    }

    It's also probably better to assign the test to a boolean variable in a line prior to the if statement, then use the boolean. Yes, it adds an extra line, but it improves the readability of the code:

    {
    var fullName = null;
    var nameIsComplete = $this->firstName && $this->lastName
    if (nameIsComplete)
    fullName = firstName . ' ' . lastName;
    return fullName;
    }

    A good next step would be to never return a null, but to instead return a more complex object that must be resolved away from null before use.

    Further, "if (!isset($_POST['file']))" is a terribly rude way to code as you have to have special knowledge to be able to decipher it. It's always best to break things down more and assign them to well-named variables, like var fileDoesNotExist = !isset($_POST['file']). I have no idea what that call does (illustrating the problem), but I am just using my interpretation as an example.

    Lastly, with multiple, nested if statements, you might want to break them down into smaller functions that only do one thing each. Yes, you end up with more functions, but the names of those functions can be more illustrative and explanatory as to what is actually going on. See Uncle Bob's discussion on refactoring into smaller functions.

  2. crazytemo says:

    The funny thing is , i came to this conclusion all by myself ,
    i have always wanted to learn clean code and i was afraid of the concept "clean code" i thought
    it was something very hard .
    after seeing this i was like ; good damn you are doing this already and it's just concepts how to handle
    your code .

    thank you for your video , i'm not afraid any more of clean code and i'm going to continue learning how to write clean code

  3. Norman Rogers says:

    In your first example you used 2 different bracketing schemes. Keep your brackets on the same level as you did for class and public; K&R style is horrible for debugging. Never mix coding styles within one source file.

  4. Kludge Engine Dev says:

    The if-statement suggestion was one I had used before, bud I drifted away from it, thinking it looked ugly. Though it may look ugly to me, you brilliantly point out that, since it is easier to read, it is easier to maintain. I must suck up my desire for beauty for the sake of maintainability. Thank you.

  5. QckSGaming says:

    The first method has a bug. What assures you that first_name or last_name even exist? You would have to do the first check regardless to make sure the variables are valid before you can return them so in the first example, you are just adding an extra check to return null before checking again to return it.

  6. Nick Barton says:

    Multiple returns in a function are horrible to debug. Better refactor all the tests for error into a separate function and write "if not error then do the pass case else do the error case. The reader can immediately see the normal functionality without having to read a page of code first. Very often the refactored function becomes reusable for something else too.

  7. Datamike says:

    This is decent advice but honestly, you could've easily cleaned that up further and this is still somewhat naive code. At the very least you could've combined the isset and in_array checks. Better even separate them into a function with a good, descriptive name, which is always more readable. This is even more important if you have lots of error checking. Even better, apply some functional programming principles, presuming PHP supports that sort of thing.

  8. Lougehrig10 says:

    I've also noticed that I tend to try and avoid if statements. I still use them, but I've found that code is much easier to read and understand if you can use math to directly manipulate the data rather than test for a bunch of conditions and directly set the values manually.

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