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What does “program to interfaces, not implementations” mean?
...ey don't know
anything about implementations.
Coding against interface means, the client code always holds an Interface object which is supplied by a factory. Any instance returned by the factory would be of type Interface which any factory candidate class must have implemented. This way the cli...
How can I add an ampersand for a value in a ASP.net/C# app config file value
...
Well... that's pretty disappointing. I mean, that the ConfigurationManager does not automatically unescape these &xyl; characters when getting them from the config file.
– Efrain
Oct 27 '17 at 12:16
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How to change color in markdown cells ipython/jupyter notebook?
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@ScottH: I do not understand what you mean by 'conversion of the notebook to latex'. I am able to convert part of the text in span to latex and jupyter renders the latex in red.
– Shishir Pandey
Aug 11 '15 at 15:59
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What is the HMVC pattern?
...e client-side HTTP request.) Kohana's emphasis on, and support for "HMVC" means that the framework has strong support for a HTTP-based service oriented architecture.
The advantage of this architectural pattern is that since the same "calling convention" is used for internal and external requests, ...
How do I get a string format of the current date time, in python?
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what does f mean in print(f"3?
– Lei Yang
Jun 6 '19 at 6:09
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Turn off CSRF token in rails 3
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@NudeCanalTroll you mean putting this in the controller where I want it wont work?
– BlackDivine
May 28 '13 at 10:27
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Check if an image is loaded (no errors) with jQuery
...original src attribute of the original image. Here's an example of what I mean:
$("<img/>")
.on('load', function() { console.log("image loaded correctly"); })
.on('error', function() { console.log("error loading image"); })
.attr("src", $(originalImage).attr("src"))
;
Hope this...
What does “Memory allocated at compile time” really mean?
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Memory allocated at compile-time means the compiler resolves at compile-time where certain things will be allocated inside the process memory map.
For example, consider a global array:
int array[100];
The compiler knows at compile-time the size of the a...
Group by multiple columns in dplyr, using string vector input
...ata %>%
group_by_at(vars(one_of(columns))) %>%
summarize(Value = mean(value))
#compare plyr for reference
df2 <- plyr::ddply(data, columns, plyr::summarize, value=mean(value))
table(df1 == df2, useNA = 'ifany')
## TRUE
## 27
The output from your example question is as expected (se...
How to avoid warning when introducing NAs by coercion
...med and if the template is not found, FALSE is returned.! before gperl, it means that we need those vector elements that do not match the template. The rest is similar to the as.num function. Example:
as.num.pattern <- function(x, pattern){
stopifnot(is.character(x))
na = !grepl(pattern, x)
...