collect Questions
3
I have two simple class ImageEntity and ImageList
how to collect result list ImageEntity to ImageList ?
List<File> files = listFiles();
ImageList imageList = files.stream().map(file -> ...
St asked 26/4, 2016 at 5:11
4
Solved
I'm porting a piece of code from .NET to Java and stumbled upon a scenario where I want to use stream to map & reduce.
class Content
{
private String propA, propB, propC;
Content(String a, S...
Flogging asked 22/3, 2016 at 18:21
9
I'm new to Scala and trying to figure out the best way to filter & map a collection. Here's a toy example to explain my problem.
Approach 1: This is pretty bad since I'm iterating through the ...
Pokeberry asked 15/6, 2015 at 1:8
1
Solved
I have the following code:
Stream.of("1,2,3,4".split(",")).mapToDouble(Double::valueOf).collect(Collectors.toList());
I want to return List<Double>.
This code doesn't compile.
I see erro...
Almeria asked 7/10, 2015 at 14:6
2
Solved
Lets say we have this boring piece of code that we all had to use:
ArrayList<Long> ids = new ArrayList<Long>();
for (MyObj obj : myList){
ids.add(obj.getId());
}
After switching to ...
Jazminejazz asked 13/11, 2014 at 9:25
2
Solved
I know that I can do a query for recent books based on an array as in
scope :recent_books, lambda {|since_dt| {:conditions=>{:created_at >= since_dt}}}
but how can I do a similar query when...
Ingather asked 16/11, 2011 at 16:32
7
Solved
From this code I don't know the difference between the two methods, collect and each.
a = ["L","Z","J"].collect{|x| puts x.succ} #=> M AA K
print a.class #=> Array
b = ["L","Z","J"]....
1
Solved
I have a collection and I'm wanting to find certain elements and transform them. I can do this in two closures but I was wondering if it is possible with only one?
def c = [1, 2, 3, 4]
def result...
3
Solved
I'm going through log file that is too big to fit into memory and collecting 2 type of expressions, what is better functional alternative to my iterative snippet below?
def streamData(file: File,...
Evelineevelinn asked 5/2, 2013 at 5:10
1
Solved
i would like to get all images/photos/wallpapers from my android device with image saved path.
I have implemented code for collect the images from sdcard as follows:
String[] mProjection = {
Med...
Dicrotic asked 14/7, 2012 at 7:9
2
I am using Rails 3.2.2 and I would like to quote all array elements with ' and return a string containing all those quoted and comma-separated elements. At this time I am using
['a', 'b', 'c'].col...
Pigpen asked 18/5, 2012 at 5:47
4
Solved
So I have an array built by collect.
@a = Relation.where(part: "v04")
@relations = @a.collect {|x| x.car}
Builds..
=> ["f03", "f04"]
@a = Relation.where(part: "v03")
@relations = @a.colle...
3
Solved
I have a class like this:
class Foo {
static hasMany = [bars: Bar]
}
When I write:
Foo.getAll()
I get a list of Foo objects like this:
[ Foo1, Foo2, Foo3 ]
When I write:
Foo.getAll().bar...
Inspissate asked 20/6, 2012 at 23:56
4
Solved
Possible Duplicate:
How do I get the nth element from a Dictionary?
If there's a Dictionary with total of Y items and we need Nth item when N < Y then how to achieve this?
Example...
Baldhead asked 17/6, 2011 at 10:37
4
Solved
I have an application I am making that creates a large number of windows controls (buttons and labels etc). They are all being made dynamically through functions. The problem I'm having is, when I ...
2
Solved
What is the Linq equivalent to the map! or collect! method in Ruby?
a = [ "a", "b", "c", "d" ]
a.collect! {|x| x + "!" }
a #=> [ "a!", "b!", "c!", "d!" ]
I could do this by iterating over ...
Icing asked 31/3, 2009 at 17:23
© 2022 - 2024 — McMap. All rights reserved.