Which is clearer form: if(!value) or if(flag == value)?

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I understand this is a subjective question, so I apologize if it needs to be closed, but I feel like it comes up often enough for me to wonder if there is a general preference for one form over the other.

Obviously, the best answer is "refactor the code so you don't need to test for falsehood" but sometimes there's no easy way to do so and the "else" branch is simply to continue processing. So when you must have an "if not false" construct, which is the preferred standard:

The not operator

if (!value)

Or the test for false

if (value == false)

if (!value) is easier/faster to follow. Subjective as you said. As long as you are consistent, this is the main thing.

EDIT

One other point to add - omitting the true/false keywords should also (hopefully) force the coder to use better named variables. Bool variables should always indicate meaning or state purpose, such as:

if (MyWallet.IsEmpty)

There is no reason with the above to use == false or == true as it's redundant. The above is human readable immediately.

Far better than having to decipher:

if (MyWallet.EmptyStatus == true) or something ridiculous like this.

5. Conditionals, ; in the second statement, 5 is not equal to 6, so we get False. Specifies a D3D12_CLEAR_VALUE structure that describes the default value for a clear color. pOptimizedClearValue specifies a value for which clear operations are most optimal. When the created resource is a texture with either the D3D12_RESOURCE_FLAG_ALLOW_RENDER_TARGET or D3D12_RESOURCE_FLAG_ALLOW_DEPTH_STENCIL flags, you should choose the

I personally like

if ((value == false) == true) ...

cause this is verifying that the statement value is false is actually evaluating to a boolean true...

and, then, obviously, covering both posssibilites adds even more clarity,

if ((value == false) == true && (value == false) != false)

<grin/>

and for those of you who are real gluttons for clarity, and demand incontrovertible readability, I'd suggest

if (((value == false) == true && (value == false) != false) == true)

Boolean Expressions, , so to test for inequality you use the inequality operator, != . Relational and equality operators always produce a bool value, as shown in Listing 3.30. A return value of zero indicates no change, and a return value of one indicates a change. Parameters. Control. Input, required. The FC to affect. Return To. Input, required. The object to which to return the Boolean. Set the parameter to an applicable object from the object list. Additional Notes. Two flags track the changes: the form flag and the control flag.

if (!value)

This is always clearer in my opinion.

if (value == false)

I hate to say this, because it sounds kind of mean, but this normally shows that the person writing the code doesn't really understand the use of boolean values. You don't need to re-validate what a boolean is in an if statement. It's redundant.

(Personally, I would be annoyed at the person too if they named the variable value instead of something more meaningful. I have a feeling what you posted is just psuedo code, I would definitely ding that on a review.)

Edit (in response to a comment below):

It may look trivial, but often it is a sign of much bigger things. Truthfully, most people who do use var == true etc. don't understand. It's just a fact. I'm not saying their stupid or they shouldn't be programmers just that there is probably something that they need to review and learn. The problem is that when logic gets much more complex, not understanding concepts like this can lead to much much bigger problems down the road. Some people say "it's a style." That's fine. The real question in this case is, "How is it beneficial for me to do it this way? What do I or other people get from it?" If you can't solidly answer that question, then you need to ask yourself "Why is this a good idea?"

True or False, 1: unSet.clear(); 2: vmSet.clear(); 3: for value ∈ values do 4: if value.flag == 'L' triples that are either in the form of (p,domain,u)[n] or in the form of (v,p,w)[m]. If the submitted from submit() method flag is not set, then fire a simple event that is cancelable named submit, at form. If the event's default action is prevented (i.e. if the event is canceled) then abort these steps. Otherwise, continue (effectively the default action is to perform the submission).

I would never use if(value == true), so just for consistency I would also not use if(value != false).

The Semantic Web -- ISWC 2011: 10th International Semantic Web , Another common form of if-statement adds an "else" clause such as with the The == operator tests if two values are exactly the same, so (a == b) is true if a and b What is the opposite of the expression (score < 100)? That is, an expression that will The boolean expressions stop evaluating as soon as the result is clear. IF fa_flag = 'T'. tt_text = value. CLEAR fa_flag. ENDIF. CHECK speak_flg NE space. IF fa_flag = 'T'. tt_text = value. CLEAR fa_flag. ENDIF. IF fa_flag EQ 'A' AND scr_flag IS INITIAL. wa_element-acc_value = value. CLEAR fa_flag. ENDIF. IF fa_flag EQ 'C'. wa_element-acc_value = value. CLEAR fa_flag. ENDIF. WHEN 'toolTip' . fa_flag = 'T'. WHEN 'font'.

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Learning Computer Architecture with Raspberry Pi, The values on which the machines operate may come from external memory or from one of a they set (change to binary 1) or clear (change to binary 0) one or more flags. If the values are equal, a flag (generally called the zero flag) is set to 1. a mnemonic, and the various operands are written in human-readable form. Value is the interface to the dynamic value stored in a flag. (The default value is represented as a string.) If a Value has an IsBoolFlag() bool method returning true, the command-line parser makes -name equivalent to -name=true rather than using the next command-line argument.

Artificial Intelligence and Expert Systems for Engineers, The meaning of the operators is the same as those in C. STRING: This data type form: [scope] 'data-type- “list of variables separated by commasThe scope of a Default values are used if flags are not specified for variables. four flags supported by DEKBASE are HIDE, CLEAR, OVERRIDABLE and VOLUNTEERABLE. If you have a static default value, you can just assign that to a variable and conditionally overwrite if a row is found. This first select returns data1, and the second select returns the default value as the name is not in the table. create table #cfg (name varchar(32) primary key, id int, data varchar(32)) insert #cfg values ('name1', null

Make a big deal out of == true?, If it's happening a lot, it could be a problem with how someBool is being named. So by adding == true, it becomes clear that x is a boolean, and not an integer being coerced to a boolean: However, it's not really worth raising a big stink about. //assing a value to the var, by the example flag=$("mycheckbox").​selected; //. Introduction. Generally, compare mode is used for generating periodic event or for generating waveforms. In compare mode, there is one compare register, where we can set value to compare with the Timer / counter register value. Once the compare value matches with timer / counter register value, compare match occurs.

Comments
  • An advantage of the first is that you can't do if (shouldLaunchMissiles = false)
  • It occurs that this being a subjective question, assuming the community feels the answers are valuable and wants to keep it, could someone make this a wiki question? I don't feel like giving anyone an "answer" credit for this question is really fair, since there's no absolutely correct answer.
  • I don't think testing for falsehood is a problem. A bigger problem would be booleans that expresses a negative condition. if (!detonated) is much clearer to me than if (unDetonated) for example.
  • @Jeffrey: It gets worse. How about if (!unDetonated)? That would make me pause while reading the code for sure.
  • @David Thornley - Exactly! That's where booleans of negative meaning inevitably lead!
  • True, consistency is the most valuable thing.
  • @CodexArcanum: But being consistently wrong or consistently unreadable is a Bad Thing.
  • @KP: Up-voted. Great point about variable names. Your answer shows how one decision in coding style can easily affect other decisions in coding style and help someone who sees the code for the first time to understand it as quickly as possible.
  • He added 10 upvotes appending my answer to his answer while I got nothing. No complains, I think these are the rules of the game :-)
  • I find it much easier to read the == false in certain situations depending on your variable names, and I find it easier to miss a ! in front of a variable as well. For example, if(!log.DeviceOn.IsValid) vs if(log.DeviceOn.IsValid == false) - I prefer the second.
  • Ah, ye olde Pattern of Redundancy Pattern.