Expression instead of statement

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How to easily turn a statement to an expression without too much clutter? I want to update a variable but then 'return' a different value from inside ?: operator and store it in variable.

This problem can be solved using the C++'s evil comma operator, in JS using an arrow function that is immediatelly called, in F# thanks to all ifs being expressions etc.

Just to make sure it is clear, I will write C++ code that would do what I want:

MyStruct obj;
int x = NULL;
x = x ? x : (setObj(obj), obj.x);

But that would look very ugly in C# because there is not comma operator and the syntax for creating an anonymous Func with one argument and one line to update the variable and another to retrieve the value would already take up a lot more space and make the code less readable than just using a normal if statement.

Updated to answer your updated question and use the ??= operator:

If setObj returns the object then:

x ??= setObj(obj).x

If setObj returns something other than void:

x ??= (setObj(obj) is var _ ? obj.x : 0);

If setObj returns void (as per @haim770 comment):

x ??= new Func<MyStruct>(() => { setObj(obj); return obj; })().x;

Readability is questionable on the second two.


Answer to original question:

How about:

MyStruct obj;
int? x = null;
x ??= (obj = getObj()).x

Expressions vs. statements, Let's start instead from one of the common definitions: An expression in a programming language is a combination of one or more explicit values,� As for expression-statements then they are ended with a semicolon. Here is the definition of the expression statement in C++. expression-statement: expression opt; And. An expression statement with the expression missing is called a null statement. Relative to the last quote I would like to point to a difference between C and C++.

You can do this:

MyStruct obj;
int? x = null;
x = x ?? (obj = getObj())?.x;

I just added ?. in case getObj returns null. Instead of condensing code, I also suggest you to look into readability and ease of debugging code

Kotlin programmer dictionary: Statement vs Expression, JavaScript distinguishes expressions and statements. An expression Such a statement is called an expression statement. The reverse You forgot to mention the comma operator instead of the group operator (). // Can be� First, unlike statements, smaller expressions can be combined (or “composed”) into larger expressions. So if everything is an expression, then everything is also composable. Second, a series of statements always implies a specific order of evaluation, which means that a statement cannot be understood without looking at prior statements.

If I understood you correctly you want an inline function? Then you can use:

var k = true;            
Func<int, bool> greater = (x) => x > 1;
k = k ? k : greater(1);

Expressions versus statements in JavaScript, (BASIC) to my second (C), one of the first things that struck me was how odd it was that assignment was an expression instead of a statement. Some expressions get their values from runtime actions that might not yet exist when a flow starts to run. To reference or work with these values in expressions, you can use functions that the Workflow Definition Language provides. More information: Functions reference for Workflow Definition Language in Power Automate. Related Articles

Expressions vs Statements, Expressions. An expression is a construct made up of variables, operators, and method invocations, which are constructed according to the syntax of the language,� The SQL statement generated by the expression is visible in the SQL statement, however the displayed query will be overwritten at run time by the expression. If you see a small icon (expression reminder) then you should update the SQL query in the expression. Summary

Expressions, Statements, and Blocks (The Java™ Tutorials , And as like with heavy enough wrench you can use it as a hammer – you can apply expression in place of a statement. No, it's not like that. To execute statements if any element is true, wrap the expression in the any function. To programmatically exit the loop, use a break statement. To skip the rest of the instructions in the loop and begin the next iteration, use a continue statement. When nesting a number of while statements, each while statement requires an end keyword.

Js Statements Vs Expressions, Note that we could also have used a Function Expression to declare A Function Expression is used inside the statement: let sayHi = ; , as a value. to improve - please submit a GitHub issue or a pull request instead of� Synonyms for statement at Thesaurus.com with free online thesaurus, antonyms, and definitions. Find descriptive alternatives for statement.

Comments
  • See github.com/dotnet/csharplang/issues/3086
  • x = x ?? new Func<MyStruct>(() => { obj = getObj(); return obj; })().x will do. But I doubt it's worth the trouble
  • @haim770 Yeah, exactly, this just looks... too bad.
  • The difference here is that the variable obj is not updated on the important line. But thank you for the rest, that|s not bad.
  • I have realised why I could not come up with this solution. I had a slightly different problem in mind. I have updated the question to match the actual problem. I apologize.
  • That seems like a reasonable point. My reasoning was that this is such a simple thing that there should be a decent, simple and short way of writing it down.