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require_relative '../../spec_helper'
require_relative 'fixtures/common'
describe "Proc#lambda?" do
it "returns true if the Proc was created from a block with the lambda keyword" do
-> {}.lambda?.should be_true
end
it "returns false if the Proc was created from a block with the proc keyword" do
proc {}.lambda?.should be_false
end
it "returns false if the Proc was created from a block with Proc.new" do
Proc.new {}.lambda?.should be_false
end
ruby_version_is ""..."3.3" do
it "is preserved when passing a Proc with & to the lambda keyword" do
suppress_warning {lambda(&->{})}.lambda?.should be_true
suppress_warning {lambda(&proc{})}.lambda?.should be_false
end
end
it "is preserved when passing a Proc with & to the proc keyword" do
proc(&->{}).lambda?.should be_true
proc(&proc{}).lambda?.should be_false
end
it "is preserved when passing a Proc with & to Proc.new" do
Proc.new(&->{}).lambda?.should be_true
Proc.new(&proc{}).lambda?.should be_false
end
it "returns false if the Proc was created from a block with &" do
ProcSpecs.new_proc_from_amp{}.lambda?.should be_false
end
it "is preserved when the Proc was passed using &" do
ProcSpecs.new_proc_from_amp(&->{}).lambda?.should be_true
ProcSpecs.new_proc_from_amp(&proc{}).lambda?.should be_false
ProcSpecs.new_proc_from_amp(&Proc.new{}).lambda?.should be_false
end
it "returns true for a Method converted to a Proc" do
m = :foo.method(:to_s)
m.to_proc.lambda?.should be_true
ProcSpecs.new_proc_from_amp(&m).lambda?.should be_true
end
# [ruby-core:24127]
it "is preserved when a Proc is curried" do
->{}.curry.lambda?.should be_true
proc{}.curry.lambda?.should be_false
Proc.new{}.curry.lambda?.should be_false
end
it "is preserved when a curried Proc is called without enough arguments" do
-> x, y{}.curry.call(42).lambda?.should be_true
proc{|x,y|}.curry.call(42).lambda?.should be_false
Proc.new{|x,y|}.curry.call(42).lambda?.should be_false
end
end
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