short-circuiting Questions
12
Solved
I have the following simple short-circuit statement that should show either a component or nothing:
{profileTypesLoading && <GeneralLoader />}
If the statement is false, it renders ...
Authorized asked 29/10, 2018 at 14:50
9
Solved
Given the following code:
if (is_valid($string) && up_to_length($string) && file_exists($file))
{
......
}
If is_valid($string) returns false, does the php interpreter still ch...
Farthing asked 17/4, 2011 at 16:25
16
Solved
Are boolean expressions in SQL WHERE clauses short-circuit evaluated
?
For example:
SELECT *
FROM Table t
WHERE @key IS NULL OR (@key IS NOT NULL AND @key = t.Key)
If @key IS NULL evaluates to ...
Orthopsychiatry asked 25/4, 2009 at 16:11
2
Solved
Python's any and all built-in functions are supposed to short-circuit, like the logical operators or and and do.
However, suppose we have a function definition like so:
def func(s):
print(s)
retu...
Lurcher asked 27/9, 2020 at 16:28
4
Solved
In PHP we can check if a key exists in an array by using the function array_key_exists().
In the Twig templating language we can check if an variable or an object's property exists simply by using...
Urinalysis asked 28/11, 2012 at 14:21
7
Solved
I'm working with Ruby on Rails and would like to validate two different models :
if (model1.valid? && model2.valid?)
...
end
However, "&&" operator uses short-circuit evaluation ...
Oidea asked 28/1, 2009 at 9:58
12
So for binary operators on booleans, Java has &, |, ^, && and ||.
Let's summarize what they do briefly here:
JLS 15.22.2 Boolean Logical Operators &, ^, and |
JLS 15.23 Condition...
Extrovert asked 24/2, 2010 at 8:25
13
Solved
In VB.NET, what is the difference between And and AndAlso? Which should I use?
Anthonyanthophore asked 19/11, 2008 at 14:36
3
Solved
I'm studying C from A Book on C by Kelley-Pohl, and there's this exercise that I don't understand:
int a = 0, b = 0, x;
x = 0 && (a = b = 777);
printf("%d %d %d\n", a, b, x);
x =...
Broderickbrodeur asked 23/8, 2017 at 20:35
6
Solved
Reading up a bit on Java 8, I got to this blog post explaining a bit about streams and reduction of them, and when it would be possible to short-circuit the reduction. At the bottom it states:
Not...
Curtice asked 24/8, 2015 at 22:37
5
Solved
In Perl (and other languages) a conditional ternary operator can be expressed like this:
my $foo = $bar == $buz ? $cat : $dog;
Is there a similar operator in VB.NET?
Gamophyllous asked 23/2, 2009 at 3:17
2
Solved
Consider this code snippet,
template<bool b>
struct other
{
static const bool value = !b;
};
template<bool b>
struct test
{
static const bool value = b || other<b>::value;
};
...
Fennie asked 5/1, 2011 at 3:24
1
I have a several boolean matrices, and I want a resulting matrix that indicates if any of the elements in that position of those matrices are true. Is there a single function in the Julia language ...
Holdall asked 3/11, 2021 at 17:58
1
I am writing a program to determine if the Levenshtein distance between two strings is exactly 2 in linear time.
I have an algorithm which does this. I use the naive recursive approach which scans ...
Winterize asked 2/9, 2021 at 12:32
3
Solved
When running the following line:
>>> [0xfor x in (1, 2, 3)]
I expected Python to return an error.
Instead, the REPL returns:
[15]
What can possibly be the reason?
Across asked 13/4, 2021 at 22:12
14
Solved
I have multiple expensive functions that return results. I want to return a tuple of the results of all the checks if all the checks succeed. However, if one check fails I don't want to call the la...
Gayelord asked 20/9, 2016 at 20:42
3
Solved
I would like to know if JavaScript has "short-circuit" evaluation like &&-operator in C#. If not, I would like to know if there is a workaround that makes sense to adopt.
Aluminize asked 23/9, 2012 at 17:34
9
Solved
I understand the difference below (at least for Java):
if( true || false ) // short-circuiting boolean operator
if( true | false ) // non-short-circuiting boolean operator
But my question is, is...
Foreandafter asked 21/8, 2013 at 5:16
4
Solved
I believe that C# stops evaluating an if statement condition as soon as it is able to tell the outcome. So for example:
if ( (1 < 0) && check_something_else() )
// this will not be call...
Alberthaalberti asked 10/9, 2020 at 8:51
5
Solved
I know that logical operators in C follow short circuiting but my doubt is that are short circuiting and operator precedence rules not opposing each other. See the below example :
#include<stdi...
Paronychia asked 12/5, 2020 at 11:49
2
Solved
This is probably a rather simple question, but I'm at a loss...
I have an if statement like the following:
if(TheEnum.A.equals(myEnum) || TheEnum.B.equals(myEnum))
TheEnum can be A, B, C, ... G...
Traditionalism asked 21/7, 2015 at 17:43
3
Solved
I'm seeing some behavior that doesn't make sense to me when I run a bash script with the -e option that has multiple commands strung together with &&s and one of them fails. I would expect ...
Penthouse asked 12/2, 2013 at 17:7
4
Solved
In the Wikipedia page describing short-circuit evaluation, & and | are listed as eager operators in Python. What does this mean and when are they used in the language?
Numismatist asked 27/6, 2011 at 5:29
2
Solved
I have a function like this:
def foo(item: Item) : Option[Int] = Try{
// Some code that can blow up
}.toOption
I have a list of items and I want to map through them, and apply the above functio...
Refreshing asked 11/2, 2020 at 21:44
8
Solved
What construct should I use to check whether a value is NULL in a Twig template?
Martica asked 16/7, 2010 at 12:38
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