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
8
votes
0 answers
ReactiveUI 6.5 - When ReactiveObject is inherited in class I get a build error Splat.dll could not be found
I'm using Visual Studio 13 Community. Created a simple WinForms project, created an empty class and inherited ReactiveObject. I've installed reactivui-winforms 6.5.0 using NuGet. I can see ver 1.0.0 was installed and Splat in references.
The…
rreynolds
- 81
- 3
8
votes
4 answers
Hash Destructuring
You can destructure an array by using the splat operator.
def foo(arg1, arg2, arg3)
#...Do Stuff...
end
array = ['arg2', 'arg3']
foo('arg1', *array)
But is there a way to destruct a hash for option type goodness?
def foo(arg1, opts)
#...Do…
Drew
- 15,158
- 17
- 68
- 77
7
votes
3 answers
Is there an easier alternative to mimicking the splat operator?
I've found it's available in Ruby, but I recognize it from what I've done in Python; the "splat" operator. Long story short, I'm wondering if there's a simpler way to accomplish what I currently am, mimicking what the "splat" operator does.
I made a…
Ian
- 50,146
- 13
- 101
- 111
6
votes
1 answer
Splatting a struct
I have a bunch of structs like this with increasing number of members, but consistent member naming:
struct one { int a; };
struct two { int a; int b; };
struct three { int a; int b; int c; };
I also have a templated function which I want to have…
Jonathan Mee
- 37,899
- 23
- 129
- 288
6
votes
2 answers
How to make PHP understand *either* an array or the splat operator (3 dots ...) for function parameters?
I have this code:
function test(...$strings)
{
// ...
}
It allows me to call test() like this:
test('a', 'series of', 'strings go here');
Which works. However, I often would like to do:
test([ 'a', 'series of', 'strings go here'…
user11555230
6
votes
1 answer
Ruby: How can I kill "warning: `*' interpreted as argument prefix"?
How can I remove the "warning: `*' interpreted as argument prefix" from the following code?
hash = {"a" => 1,
"b" => 2,
"s" => 3,}
if "string".start_with? *hash.keys then
puts "ok"
else
puts "ng"
end
When I run the code above,…
Yasushi Shoji
- 4,028
- 1
- 26
- 47
6
votes
1 answer
Julia: using splat to pass along arguments
I am trying to write a function that calls several functions that accept named parameters. I'd like the A function to be able to named parameters splatted together in args and pass along the matching arguments to the functions it calls.
function…
Rob Donnelly
- 2,256
- 2
- 20
- 29
6
votes
1 answer
Passing splat on nil as argument
All values for b below let me call a method with the *args syntax.
def some_method(a)
puts a
end
b = 1
some_method(*b) # => 1
b = false
some_method(*b) # => false
b = "whatever"
some_method(*b) # => "whatever"
With nil, I expected to get nil,…
Automatico
- 12,420
- 9
- 82
- 110
6
votes
2 answers
Ruby to_s conversion to binary (Splat operator in argument)
If I run the following code, the first two lines return what I expect. The third, however, returns a binary representation of 2.
2.to_s # => "2"
2.to_s * 2 # => "22"
2.to_s *2 # => "10"
I know that passing in 2 when calling to_s will…
slapthelownote
- 4,249
- 1
- 23
- 27
5
votes
2 answers
What's the feature in Ruby that allows "p *1..10" to print out the numbers 1-10?
require 'pp'
p *1..10
This prints out 1-10. Why is this so concise? And what else can you do with it?
Paul H.
- 53
- 3
5
votes
3 answers
Handling a method with an optional argument followed by a list of keyword arguments
I want to pass an optional argument (any datatype, even a Hash) followed by a list of keyword arguments (which can be empty) to a method.
This is what I got:
def my_method(subject = nil, **options)
[subject, options]
end
The method output is as…
Taschetto
- 321
- 3
- 14
5
votes
1 answer
Using splat operator with when
Case statement:
case x
when 1
"one"
when 2
"two"
when 3
"three"
else
"many"
end
is evaluated using the === operator. This operator is invoked on the value of the when expression with the value of the case expression as the argument. The…
X. Wang
- 973
- 1
- 11
- 21
5
votes
2 answers
What is the standalone splat operator (*) used for in Ruby?
I just came across this example where the splat operator is used by itself in a method definition:
def print_pair(a,b,*)
puts "#{a} and #{b}"
end
print_pair(1,2,3,:cake,7)
#=> 1 and 2
It is clear what and why you would use it in a context like…
Severin
- 8,508
- 14
- 68
- 117
5
votes
3 answers
What does a * in front of a string literal do in ruby?
This code seems to create an array with a range from a to z but I don't understand what the * does. Can someone please explain?
[*"a".."z"]
MakeM
- 107
- 5
5
votes
3 answers
Ruby rubocop: how to freeze an array constant generated with splat
I'm assigning an array constant like this:
NUMS = *(2..9)
Rubocop says
C: Freeze mutable objects assigned to constants.NUMS = *(2..9) ^^^^^
So I try
NUMS = *(2..9).freeze
Rubocop says
C: Freeze mutable objects assigned to…
dirkdirk
- 171
- 2
- 10