smore | A desktop app for writing Medium stories | Dektop Application library
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kandi X-RAY | smore Summary
A desktop app for writing Medium stories
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QUESTION
I had a copy/paste error in my code and ended up with a line that looked like:
myString = otherString; + "?" + anotherString;
The code after the first semicolon wasn't issuing any errors or warnings. Using an online compiler to double check my environment, I created this quick example that also compiles and runs:
...ANSWER
Answered 2019-Nov-06 at 17:30Literal strings (like e.g. "???"
) are really arrays of characters. And as all other arrays they decay to pointers to themselves. And this is what happens here, the expression + "???"
applies the unary +
operator on the pointer to the first element of the string.
This results in another pointer (to a character) that is equal to the first, and which can then be used to add to std::string
objects.
The same thing happens for other literals, like numbers, which is why +4
is valid as well.
But there's no unary +
operator defined for std::string
which is why you get an error for +sMore
.
QUESTION
I work with small Spring boot app and I get the error triggered by the method findAll()
from the controller,
ANSWER
Answered 2017-Oct-03 at 07:05Try to change your
QUESTION
I parse a CSV into an associative array. The array outputs as
Array (
[indices 0-24...]
[Susie Wagner] => Array ( [Chocolate Peanut Butter Pronuts - 3] => 1 [Smores Protein Bites - 10] => 1 [Vanilla Pumpkin Pronuts - 6] => 0.5 )
[Mr. Hirthler] => Array ( [Ground Beef with Brown Rice - Signature] => 3 [Ground Turkey with Mashed Sweet Potatoes - Signature] => 2 [Vegetarian Zucchini Noodle Lasagna - Signature] => 2 ) )
as shown by print_r of array built in CSV parsing.
Then I loop over the array
...ANSWER
Answered 2019-Aug-11 at 01:53This exact behaviour is documented in the warning in the foreach
reference:
Reference of a $value and the last array element remain even after the foreach loop. It is recommended to destroy it by unset()
So at the end of the previous loop, $v
is still a reference to the last element on the iteration (it points to the same memory area) and when creating a new loop with foreach ($meals as $k => $v)
, each item in the array is copied by value into the existing reference (the last element of the array) overwriting the previous value.
Everything looks fine while you are iterating the firsts elements on the array, but when it reaches the last element in the iteration the current value of the reference is the last element iterated (the second to last in the array) so it gets copied and the bug manifests itself. That's why prior to the foreach
you get the expected result until you reach the last element.
Actually, the bug is present as soon as you start the loop: if you were to output the last element in the array alongside the current value, you'd see that they are the same. But this is not something you usually do.
QUESTION
I'm new to mongoose and Node, but this is the route for my page for showing one campground. For some reason, the callback function for findById is running both if and else statements below. So my code works in finding the correct object and displaying it in the browser, but it also seems to be returning an undefined object.
Also, when I console.log(camp.name) in the callback function, it throws an error and says that it cannot reference the name property of undefined...so it seems to be referencing some undefined object even though it did find the object i'm looking for.
...ANSWER
Answered 2018-Feb-12 at 02:28It looks like you are making two requests, one to "/campgrounds/5a80c8c54d30a717de9121f4" that find the correct object, and an other one to "/campgrounds/campgrounds.js" that returns undefined.
QUESTION
When I run my flyway script to insert into a table in PostgreSQL 10.0 I get a duplicate key value violates unique constraint and I can't understand why
The SQL (V1.1.2__insert_candy.sql)
...ANSWER
Answered 2018-Mar-19 at 20:40After @Karol Dowbecki's comment I checked the sequence (I didn't even know that was a thing)
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