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require_relative '../spec_helper'
describe "The loop expression" do
it "repeats the given block until a break is called" do
outer_loop = 0
loop do
outer_loop += 1
break if outer_loop == 10
end
outer_loop.should == 10
end
it "executes code in its own scope" do
loop do
inner_loop = 123
break
end
lambda { inner_loop }.should raise_error(NameError)
end
it "returns the value passed to break if interrupted by break" do
loop do
break 123
end.should == 123
end
it "returns nil if interrupted by break with no arguments" do
loop do
break
end.should == nil
end
it "skips to end of body with next" do
a = []
i = 0
loop do
break if (i+=1) >= 5
next if i == 3
a << i
end
a.should == [1, 2, 4]
end
it "restarts the current iteration with redo" do
a = []
loop do
a << 1
redo if a.size < 2
a << 2
break if a.size == 3
end
a.should == [1, 1, 2]
end
it "uses a spaghetti nightmare of redo, next and break" do
a = []
loop do
a << 1
redo if a.size == 1
a << 2
next if a.size == 3
a << 3
break if a.size > 6
end
a.should == [1, 1, 2, 1, 2, 3, 1, 2, 3]
end
end
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