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Contents
describe "Array#pop" do
it "removes and returns the last element of the array" do
a = ["a", 1, nil, true]
a.pop.should == true
a.should == ["a", 1, nil]
a.pop.should == nil
a.should == ["a", 1]
a.pop.should == 1
a.should == ["a"]
a.pop.should == "a"
a.should == []
end
it "returns nil if there are no more elements" do
[].pop.should == nil
end
describe "passed a number n as an argument" do
it "removes and returns an array with the last n elements of the array" do
a = [1, 2, 3, 4, 5, 6]
a.pop(0).should == []
a.should == [1, 2, 3, 4, 5, 6]
a.pop(1).should == [6]
a.should == [1, 2, 3, 4, 5]
a.pop(2).should == [4, 5]
a.should == [1, 2, 3]
a.pop(3).should == [1, 2, 3]
a.should == []
end
it "returns an array wih the last n elements even if shift was invoked" do
a = [1, 2, 3, 4]
a.shift
a.pop(3).should == [2, 3, 4]
end
it "returns a new empty array if there are no more elmeents" do
a = []
popped1 = a.pop(1)
popped1.should == []
a.should == []
popped2 = a.pop(2)
popped2.should == []
a.should == []
popped1.should_not equal(popped2)
end
it "returns whole elements if n exceeds size of the array" do
a = [1, 2, 3, 4, 5]
a.pop(6).should == [1, 2, 3, 4, 5]
a.should == []
end
it "does not return self even when it returns whole elements" do
a = [1, 2, 3, 4, 5]
a.pop(5).should_not equal(a)
a = [1, 2, 3, 4, 5]
a.pop(6).should_not equal(a)
end
it "raises an ArgumentError if n is negative" do
lambda { [1, 2, 3].pop(-1) }.should raise_error(ArgumentError)
end
end
end
Version data entries
23 entries across 23 versions & 1 rubygems