Refinements take place at block passing. [Feature #14223]
https://github.com/ruby/ruby/blob/v2_6_0/NEWS
It's very useful when you want to use th...
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&o.:[]
the amount of sugar in these 6 symbols gave me diabetes.140% symbols😋🍭
map(&o.:[])
(
&
.
:
[
]
)
map{|k|o[k]}
{
|
[
]
}
I don't have a damn idea what I am looking at.
My guess is
&1
is1.to_proc()
ando
is the receiver object (e.g.a.map(&0)
would doa.map( -> a[0])
) and the sugar diabetes thingy isa.[].to_proc()
. If I'm wrong please correct me @hanachin .There's something similar in Kotlin though I like their implementation more.
That's correct!
&
would implicitly call#to_proc
to convert the object to Proc object.But before 2.6,
#to_proc
that defined in Refinements are ignored at&
operator.In 2.6, we can use
#to_proc
for&
operator.