I’m tempted to lie and say that English is my second language…but the truth is that I just have no idea what ‘Coalescing’ means. I know what ?? ‘does’ in C#, but the name doesn’t make sense to me. I looked up the word and I understand it to be a synonym for ‘join’. I’d … Read more
The null coalescing operator has very low precedence so your code is being interpreted as: int? x = 10; string s = (“foo” + x) ?? (0 + “bar”); In this example both expressions are strings so it compiles, but doesn’t do what you want. In your next example the left side of the ?? … Read more
Well, first of all, it’s much easier to chain than the standard ternary operator: string anybody = parm1 ?? localDefault ?? globalDefault; vs. string anyboby = (parm1 != null) ? parm1 : ((localDefault != null) ? localDefault : globalDefault); It also works well if a null-possible object isn’t a variable: string anybody = Parameters[“Name”] ?? … Read more
PHP 7 adds the null coalescing operator: // Fetches the value of $_GET[‘user’] and returns ‘nobody’ // if it does not exist. $username = $_GET[‘user’] ?? ‘nobody’; // This is equivalent to: $username = isset($_GET[‘user’]) ? $_GET[‘user’] : ‘nobody’; You could also look at short way of writing PHP’s ternary operator ?: (PHP >=5.3 only) … Read more
This is Unity screwing with you. If you do this: MeshFilter GetMeshFilter() { MeshFilter temp = myGo.GetComponent<MeshFilter>(); if ( temp == null ) { Debug.Log( ” > Get Mesh Filter RETURNING NULL” ); return null; } return temp; } It works. Why? Because Unity has overridden Equals (and the == operator) on all Unity objects … Read more
Aside from what you’d like the precedence to be, what it is according to ECMA, what it is according to the MS spec and what csc actually does, I have one bit of advice: Don’t do this. I think it’s much clearer to write: string c = (a ?? “”) + (b ?? “”); Alternatively, … Read more
Powershell 7+ Powershell 7 introduces native null coalescing, null conditional assignment, and ternary operators in Powershell. Null Coalescing $null ?? 100 # Result is 100 “Evaluated” ?? (Expensive-Operation “Not Evaluated”) # Right side here is not evaluated Null Conditional Assignment $x = $null $x ??= 100 # $x is now 100 $x ??= 200 # … Read more
The example you were quoting from uses LINQ to Objects, where the implicit lambda expressions in the query are converted into delegates… whereas you’re using EF or similar, with IQueryable<T> queryies, where the lambda expressions are converted into expression trees. Expression trees don’t support the null conditional operator (or tuples). Just do it the old … Read more
Elvis ?: returns the first argument if it contains a “true-ish” value (see which values are considered loosely equal to true in the first line of the Loose comparisons with == table). Or the second argument otherwise $result = $var ?: ‘default’; // is a shorthand for $result = $var ? $var : ‘default’; Null … Read more
There is a new operator in php 5.3 which does this: ?: // A echo ‘A’ ?: ‘B’; // B echo ” ?: ‘B’; // B echo false ?: ‘B’; // B echo null ?: ‘B’; Source: http://www.php.net/ChangeLog-5.php#5.3.0