short-circuiting Questions
3
Solved
This is a problem that occurred to me while working on a Django project. It's about form validation.
In Django, when you have a submitted form, you can call is_valid() on the corresponding form obj...
Alienist asked 5/9, 2012 at 12:29
2
Solved
Technet's about_Logical_Operators with respect to Windows PowerShell 4.0 states the following:
Operator Description Example
-------- ------------------------------ ------------------------
-or Lo...
Notation asked 5/11, 2014 at 20:31
2
Solved
Consider the following simple test:
import numpy as np
from timeit import timeit
a = np.random.randint(0,2,1000000,bool)
Let us find the index of the first True
timeit(lambda:a.argmax(), numbe...
Rescript asked 4/8, 2019 at 11:33
1
Solved
I want to be able to evaluate whether a function accepts one argument of type int, and whether it returns void. To that end I used std::conjunction since I believed it was supposed to short-circuit...
Pointblank asked 13/7, 2019 at 11:41
6
Solved
I have three tables:
SmallTable
(id int, flag1 bit, flag2 bit)
JoinTable
(SmallTableID int, BigTableID int)
BigTable
(id int, text1 nvarchar(100), otherstuff...)
SmallTable has, at most, a fe...
Munroe asked 25/1, 2010 at 21:5
2
Solved
I'm trying to build a Haskell function that does basically the same thing as Prelude's product. Unlike that function, however, it should have these two properties:
It should operate in constant s...
Gorse asked 14/3, 2019 at 19:51
3
Solved
My understanding of short circuit evaluation is that an expression is only called when needed in an if statement. Does Go follow this?
For instance, would I get better performance on average from:...
Veracity asked 11/12, 2018 at 10:37
4
Solved
Prompted by the discussion here
The docs suggest some equivalent code for the behaviour of all and any
Should the behaviour of the equivalent code be considered part of the definition, or c...
Offer asked 6/2, 2013 at 13:16
6
Solved
I saw this line in the jQuery.form.js source code:
g && $.event.trigger("ajaxComplete", [xhr, s]);
My first thought was wtf??
My next thought was, I can't decide if that's ugly or elega...
Basham asked 19/2, 2011 at 5:9
3
Solved
I want to write a templatized function which takes either an array<int, 3> or an int[3]. I'm trying to capture that in an enable_if:
template<typename T>
enable_if_t<is_array_v<T...
Whisenhunt asked 29/8, 2018 at 14:27
5
Solved
I cannot produce example in Python which shows Boolean operator precedence rules combined with short circuit evaluation. I can show operator precedence using:
print(1 or 0 and 0) # Returns 1 becau...
Shied asked 10/8, 2018 at 10:2
2
Solved
I am reading about Java streams' short-circuiting operations and found in some articles that skip() is a short-circuiting operation.
In another article they didn't mention skip() as a short-circui...
Levalloisian asked 28/7, 2018 at 13:37
2
Solved
In C++17, are fold expressions subject to short-circuiting when used with && or || as their operator? If so, where is this specified?
Desiderative asked 1/5, 2018 at 4:15
3
Solved
I have a test which goes:
if(variable==SOME_CONSTANT || variable==OTHER_CONSTANT)
In this circumstances, on a platform where branching over the second test would take more cycles than simply doi...
Stereobate asked 22/2, 2018 at 14:4
9
Solved
Assume myObj is null. Is it safe to write this?
if(myObj != null && myObj.SomeString != null)
I know some languages won't execute the second expression because the && evaluates ...
Definite asked 27/1, 2011 at 19:1
4
Solved
Python short circuits the logical operators.
for eg:
if False and Condition2:
#condition2 won't even be checked because the first condition is already false.
Is there a way to stop this b...
Xymenes asked 3/10, 2017 at 8:49
3
Solved
In JavaScript and Java, the equals operator (== or ===) has a higher precedence than the OR operator (||). Yet both languages (JS, Java) support short-circuiting in if statements:
When we have if(...
Willetta asked 30/9, 2017 at 19:2
3
Solved
I'm aware of Swift's higher-order functions like Map, Filter, Reduce and FlatMap, but I'm not aware of any like 'All' or 'Any' which return a boolean that short-circuit on a positive test while enu...
Arginine asked 2/6, 2017 at 20:41
5
Solved
Consider this code
Object found = collection.stream()
.filter( s -> myPredicate1(s))
.filter( s -> myPredicate2(s))
.findAny()
Will it process entire stream, and call both myPredicate1 ...
Dibucaine asked 25/5, 2017 at 12:3
1
Solved
#include <type_traits>
#define FORWARD(arg)\
std::forward<decltype(arg)>(arg)
template<typename... Args>
constexpr bool AndL(Args&&... args)
{
return (... && FO...
Benil asked 27/3, 2017 at 13:31
2
Solved
In laravel, in order to validate some input from user, we can use Validator Class.
for example for a registration by email , validation rule can be:
array( 'email' => 'required|email|unique:us...
Hypocycloid asked 19/12, 2013 at 22:17
1
Solved
I read in http://en.cppreference.com/w/cpp/language/operators:
The boolean logic operators, operator && and operator ||
Unlike the
built-in versions, the overloads do not sequence th...
Maybellemayberry asked 19/12, 2016 at 16:49
7
Solved
Does the ANSI standard mandate the logical operators to be short-circuited, in either C or C++?
I'm confused for I recall the K&R book saying your code shouldn't depend on these operations bein...
Spartacus asked 10/3, 2009 at 0:23
2
Solved
Recently came across short-circuit evaluation and was a little confused by it as i only got into programming the past week. From what i understand if what ever comes before the first double pipe is...
Sick asked 4/11, 2016 at 0:34
3
Solved
How can I tell if OCaml recognizes a particular function as tail-recursive? In particular, I want to find out if the OCaml compiler recognizes Short-circuited operators and tail recursion
Thanks...
Watch asked 20/4, 2014 at 19:33
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