block Questions
1
Solved
I understood how ruby's block works.
block_test.rb
def foo
yield if block_given?
end
my_block = foo { puts "hello" }
if I run, ruby block_test.rb. Of course it print 'hello' as you expected....
3
From a language design perspective, why aren't ruby blocks first-class?
Similarly, I think blocks should actually be lambdas, thereby getting rid of the need for cumbersome syntax such as proc {.....
Arterial asked 13/7, 2011 at 21:18
5
Solved
I have a user-space application that generates big SCSI writes (details below). However, when I'm looking at the SCSI commands that reach the SCSI target (i.e. the storage, connected by the FC) som...
Headcheese asked 8/5, 2012 at 7:41
3
Solved
I know that when we use block we should use weakSelf to avoid retain cycle.But I saw there is a strongSelf in block sometimes.
What confused me are:
why must change weakSelf to strongSelf?
if we...
Franciscafranciscan asked 13/7, 2017 at 2:55
2
Solved
I am building a custom Gutenberg block that makes a request to the WordPress REST API to get some Posts. I'm using axios to make the request to the REST endpoint.
When the result comes back, there...
Handcuff asked 7/9, 2018 at 20:16
6
Solved
The code below makes error.. How could I resolve this problem?
{% block header %}
<link rel="stylesheet" href="{% static 'shop/style.css' %}" />
{% endblock %}
The error output:
Templ...
3
Solved
I am trying to perform an animation on a label where a flip animation happens and after it is done and after a delay, The text of the label changes.
It seems that the delay never happens. The text...
Trier asked 23/11, 2011 at 16:18
5
I'm getting an Error
ERROR: invalid page header in block 411 of relation "t_value_time"
in my PostgreSQL database. This keeps happening on different machines. Is there a way to prevent it from h...
Adequacy asked 7/3, 2011 at 13:36
3
I am writing a helper DSL to make it easier to craft a nice menu ui within a view. The view's erb is producing an error undefined method 'safe_append=' for nil:NilClass when I break the block acros...
Quidnunc asked 19/4, 2019 at 12:11
4
I want to be able to call an anonymous lambda from within itself using Ruby. Consider the following recursive block (returns a factorial). I know I can assign it to a variable, and that variable is...
1
EDIT: It seems that, at least in this case, transposing the grid has a negative effect on the L2 Cache Bandwidth. This was obtained from the visual profiler. The reason why is not clear to me yet.
...
Cristinecristiona asked 8/2, 2018 at 15:38
2
Solved
In Objective-C, I used this handling of a completion-block that now must be transformed to Swift:
in DetailDisplayController.h
typedef void (^AddedCompletitionBlock)(BOOL saved, NSString *primary...
2
If any one want to remove container (block) like product.info.main from Product Detail Page based on certain conditions or product has attribute with value assigned.
Then what is the best approach ...
Ranking asked 10/3, 2018 at 12:45
3
Solved
Assuming a pipe,
int pipe_fd[2];
pipe(pipe_fd);
We fork, and expect that one process will write into the pipe at an arbitrary time. In one of the processes, we want to be able to check the conte...
5
Solved
p = Proc.new{ puts 'ok' }
Is is possible to see the ruby code in the proc?
inspect returns the memory location:
puts p.inspect
#<Proc:0x007f9e42980b88@(irb):2>
Ruby 1.9.3
1
Solved
I have the following code:
int main() {
int i=0;
int j=({int k=3;++i;})+1; // this line
return 0;
}
It compiles and runs. If I remove the () from "this line", then it doesn't compile.
...
Chauffeur asked 13/9, 2018 at 11:56
2
I'm trying to create a estimation of the size of a chain if i create a new blockchain using hyperldger.
In order to have an idea of disk space usage i would like to know that is the average size o...
Maestas asked 14/5, 2018 at 18:7
4
I am messed with both completion handler and blocks while I am using them in Swift and Objective-C. And when I am searching blocks in Swift on google it is showing result for completion handler! Ca...
Nuncio asked 21/9, 2016 at 7:11
1
Solved
Hello I have following requirement.
I want to call completion block after the delegate method triggered.
Please find bellow sample snippet as example.
typealias CompletionBlock = (_ result: NSDa...
1
Solved
Most of the examples I found use Pandas DataFrame in order to have multiple boxes in a single box plot. I would like to know if there is a simpler, more straight forward way by directly using numpy...
4
Solved
I have two matrices A and D with sizes mxm. I want to create with these two a block matrix B size mn x mn . For example if n=5 then the output will be
B= D A A A A
A D 0 0 0
A 0 D 0 0
A 0 0 D 0...
3
Right now I'm using this line of code to at least try to block popups by JavaScript in webview:
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
1) I don't get it why I have ...
Untwine asked 25/6, 2017 at 11:31
2
Solved
I am learning ReactiveObjC , the ReactiveCocoa Objective-C version.
For the code following: In RACSignal.h ,
- (RACSignal *)reduceEach:(id _Nullable (^)())reduceBlock RAC_WARN_UNUSED_RESULT;
...
Craigcraighead asked 21/12, 2017 at 1:18
5
Solved
I'm using the validator plugin found here to validate a form.
Problem I'm having is if I put the following around a form input element the validation fails:
<div style="display:none;"><i...
Puri asked 6/9, 2012 at 20:48
4
Solved
I just stomped at a begin...end in Erlang's documentation (here), but it doesn't give some examples of how it is useful.
Looking here in StackOverflow I found two cases where people would be using...
Inextricable asked 21/11, 2013 at 15:39
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