The `*` operator as used in Ruby. So called because it looks like an insect that's splatted on a windscreen.
The * operator as used in Ruby. So called because it looks like an insect that's splatted on a windscreen.
Questions tagged [splat]
166 questions
3
votes
3 answers
Ruby Koans about message passing "send" block & arguments
I am working on Ruby Koans about_message_passing.rb and got the code working for method_missing as follows:
def method_missing(method_name, *args, &block)
@messages << method_name
@object.__send__(method_name, *args, &block)
end
This code seems…
ZenBalance
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2
votes
2 answers
Can you combine keyword argument expansion with regular keyword arguments?
What I want to do is this:
logged_in = {
'logged_in': True,
'username' : 'myself',
}
print render_template('/path/to/template.html',
**logged_in,
title = 'My page title',
more = 'even more stuff',
)
But that doesn't…
st-boost
- 1,877
- 1
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2
votes
2 answers
In Julia how to deal neatly with Zero Dimensions and Iterators
Consider the following scenario:
do_something( v :: Vector{ T } ) where { T <: Integer } = println( "v = $v" )
function d_dep( d :: Integer )
axis_iters = fill( -1:1, d )
for ig in Iterators.product( axis_iters ... )
g = [ ig ...…
Ian Bush
- 6,996
- 1
- 21
- 27
2
votes
2 answers
Ruby hash.dig using array as argument?
I have a nested hash of data
foo => {
'user' => {
'address' => {
'street' => '1234'
}
}
}
I can access the values using Hash.dig
foo.dig('user', 'address', 'street')
1234
How would you use hash.dig when the values are variable,…
spuder
- 17,437
- 19
- 87
- 153
2
votes
1 answer
How is the splat operator understood when applied to a range expression?
I found that the expression [*1..4] returns the same as if I would do a (1..4).to_a, but I don't understand the syntax here. My understanding is that * is - being a unary operator in this case - to be the splat operator, and to the right of it, we…
user1934428
- 19,864
- 7
- 42
- 87
2
votes
2 answers
How to access a Ruby splat argument?
I have overridden the send_devise_notification methods from my devise gem.
I need to access the first element in the *args array, and I would assume this can be achieved with *args[0].
I am expecting a string, but check out the strange output…
JohnSmith1976
- 536
- 2
- 12
- 35
2
votes
1 answer
Scala Splat inner workings
I know in scala I can say
def foo(x: Int*) ...
foo(Seq(1,2,3): _*)
But I can't say
foo(Seq(1,2,3))
So there must be some implicit conversion going on. What is this implicit conversion? What is the actual method that makes this happen. Or, if I'm…
munk
- 12,340
- 8
- 51
- 71
2
votes
2 answers
Is there a way to use non Tuple objects with splat operator in Crystal?
Is there some function or syntax construction to make next examples work?
Invoke Hash#values_at function with an Array argument:
h = {"a" => 1, "b" => 2, "c" => 3}
ary = ["a", "b"]
h.values_at(*ary) # Error: argument to splat must be a tuple, not…
Mikhail Gordeev
- 23
- 4
2
votes
1 answer
Can't register a View and ViewModel between 2 assemblies (UWP, Splat)
Using the latest RxUI v8 preview and Splat 2.0, in a UWP project referencing a .Net Standard 2.0 library, I can't register my view and viewmodel unless they reside in the same assembly.
I have:
Locator.CurrentMutable.RegisterLazySingleton(() => new…
Maximus
- 1,441
- 14
- 38
2
votes
1 answer
Expanding empty hash in variable with double splat in Ruby
I got this strange behavior trying to expand the hash variable using double splat. Do not know why this is happening.
My ruby version
ruby 2.2.6p396 (2016-11-15 revision 56800)
Scenario
class MyClass
def my_method;…
rafaels88
- 839
- 1
- 6
- 19
2
votes
1 answer
Is there a way without a (*)splat argument to pass multiple arguments in Ruby?
I need to write a method that takes an unknown number of arguments (hence the *splat) but that passes a yields_with_args spec.
The code:
def eval_block(*args, &block)
raise "NO BLOCK GIVEN!" if block.nil?
block.call(args)
end
The…
Andrea McKenzie
- 239
- 1
- 12
2
votes
2 answers
Is it possible to invert a splat in Ruby?
Ruby's splat operator * may be used to coalesce
def one_argument(*a)
...
end
one_argument(1, 2, 3)
or split
def multiple_arguments(a, b, c)
...
end
multiple_arguments(*[1, 2, 3])
multiple values, depending on the context.
Is it possible to…
Max Wallace
- 3,609
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- 42
2
votes
2 answers
ReactiveUI.Routing dependency on Splat
The ReactiveUI.Routing requires us to register the views in Splat container (Locator.CurrentMutable). If I don’t register it with Splat it is not working.
If we are using some other IOC container or service locator like Ninject, is tere a way to…
Rajan
- 121
- 7
2
votes
1 answer
Local or remote execution of powershell script with generic parameters
In a development team, I would like to have the same test scripts to be executed locally by a developper or remotely by our test platform.
Here is what I would like to use as premises for each script
# Test local/remote execution by reading C:\…
FoxAlfaBravo
- 106
- 1
- 12
2
votes
2 answers
Splat operator or regex not working?
I'm new to Ruby and building Chess as a learning exercise. I'm attempting to refactor some code, and I'm stymied.
Why does this work:
@available_moves = []
#part of castling logic
@available_moves << "c1" if empty?("b1") && empty?("c1") &&…
spectre6000
- 455
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