I want to conditionally prepend a (non-materialized) Source with a value. How should I do this?
val src: Source[_,NotUsed] = ???
Source.combine(Source.single(???), src)
The Source.combine documentation mentions
using a given strategy such as merge or concat
, but does not provide an example on selecting concat strategy.
This does it:
Source.combine( Source.single(None), tmp2 )(Concat[T])
T being the value of elements you want in the source.
Answering my own question since I think this can be useful for others, and there was no existing answer on SO.
Related
I am trying to duplicate all values in an array in my sheet. I have {1,6,14,15} and I want to output {1,1,6,6,14,14,15,15}. I would like to do this exclusively with functions. I have seen the VSTACK function, which seems very useful, however joining the insider thing seems like a hassle and would not allow this spreadsheet to be usable across other devices easily.
I have tried the CONCAT function, however this simply returns 161415161415 which is not helpful to me. The various alternatives to VSTACK all remove duplicates, which is exactly not what I am looking for. Besides all of those alternatives are lengthy and hard for me to wrap my head around.
You could use EXPAND() here:
=LET(arr,{1,6,14,15},TOROW(IFERROR(EXPAND(arr,2),arr),,1))
Note that 2 will define how often you want to duplicate the input.
If you have LET and SEQUENCE:
=LET(ζ,{1,6,14,15},INDEX(ζ,SEQUENCE(,2*COUNTA(ζ),,0.5)))
For instance, is it possible to define:
#FindBy(By.id("id1") OR By.id("form1:id1"))
public WebElement button
So that button having either "id1" or "form1:id1" should work fine?
You can use the #FindBys annotation, the syntax is:
#FindBys({#FindBy(id = "foo"),
#FindBy(className = "bar")})
The JavaDoc describes it here:
http://selenium.googlecode.com/git/docs/api/java/org/openqa/selenium/support/FindBys.html
Well,
use whathever you want, as long as it works
Personally I would use #FindBy(By.id("id1")) but it is just point of choice.
Also, there is no value added in referring same element twice with two different methods. It will only cause mess in your code
EDIT
As I understood your comment, there is element on the page which constantly changes its ID. If you need to refer to such elements, try using xPath See for example this xpath tutorial
The idea is that you will point to some place in the DOM rather than to specific ID
Use Xpath or CSS selector to do that. Or Java to store the ID name in String and then you can fill it to your Id.
I am trying to globalize a simple WPF app. In several questions and/or answers on SO I see one of the following two settings on the binding:
StringFormat=C
StringFormat='{}{0:C}'
What is the difference between these? Are there certain conditions where you would use one over the other?
My understanding is that there is no difference, one is just shorthand and the other explicit. The only condition I can think of where being explicit is beneficial is when you want more control over the format. For example:
StringFormat=Total: {0:C}
Other than that, I'd say keep it simple; XAML is already verbose and shorthand syntax is welcome.
Maybe read up string formatting?
http://msdn.microsoft.com/en-us/library/dd465121.aspx
You can use {0:C} in a format string where you are filling in a value:
decimal value = 123.456;
Console.WriteLine("Your account balance is {0:C2}.", value);
while, you use the C as a plain format:
Console.WriteLine(("Your account balance is " + decimal.Parse("24.3200").ToString("C"));
they are functionally equivalent as far as the output. It's just a different way to format the data based on the context of how your using it.
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx#CFormatString
I would like to use a dynamic sql statement that executes only when the variable is not null AND greater than zero. Like this:
<isNotNull prepend="AND" property="ProprietaryId">
<isGreaterThan prepend="AND" property="ProprietaryId" compareValue="0">
G.PROPRIETARY_ID = #ProprietaryId#
</isGreaterThan>
</isNotNull>
but without prepending two 'AND's.
I have read the documentation but have found no good example.
To work around to this issue I almost never use the "prepend" feature, but instead write an sql like this:
WHERE 1=1
<isNotNull property="ProprietaryId">
<isGreaterThan property="ProprietaryId" compareValue="0">
AND G.PROPRIETARY_ID = #ProprietaryId#
</isGreaterThan>
</isNotNull>
I just came across this question while looking for the same answer. While effective, this solution kind of bugged me so I studied the iBATIS docs some more and noticed this example:
<dynamic prepend="where">
<isGreaterThan prepend="and" property="id" compareValue="0">
ACC_ID = #id#
</isGreaterThan>
<isNotNull prepend="and" property="lastName">
ACC_LAST_NAME = #lastName#
</isNotNull>
</dynamic>
You'd think that might cause a superfluous "and" to be included within the WHERE clause if only one of the conditions is true, but apparently iBATIS is smart enough to prevent this when using the dynamic tag. It works for me (using iBATIS 2.3.0 in this case).
Its me from the future. Parent elements override the prepend of their first child, so your code will work fine since the isGreaterThan prepend will be overwritten by the parent isNotNull prepend.
From the docs:
The prepend attribute is a part of the code that is free to be overridden by the a parent element's prepend if necessary. In the above example the "where" prepend will override the first true conditional prepend. This is necessary to ensure that the SQL statement is built properly. For example, in the case of the first true condition, there is no need for the AND, and in fact it would break the statement.
<isNotNull property="ProprietaryId">
<isGreaterThan prepend="AND" property="ProprietaryId" compareValue="0">
G.PROPRIETARY_ID = #ProprietaryId#
</isGreaterThan>
</isNotNull>
just delete the first prepend will work
To outline: I have a parser that grabs Cell references using the following regex
"$"?{letter}{1,2}"$"?{digit}{1,3}
I cant seem to find an elegant way to split the resulting char* into its row, and column components.
ex. split a1 into a and 1
or
split $aa$4 into fixed_col a fixed row 4
Any help is appreciated.
Are you using a regex library? If so does it support accessing grouped parts of the regex, something like:
("$"?)({letter})({1,2})("$"?)({digit}{1,3})
(This article shows the technique using the .NET regex library)
If that isn't an option, then building a simple state machine would work well, and be easy to maintain and test.