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Contents
describe "Array#first" do
it "returns the first element" do
%w[a b c].first.should == 'a'
[nil].first.should == nil
end
it "returns nil if self is empty" do
[].first.should == nil
end
it "returns the first count elements if given a count" do
[true, false, true, nil, false].first(2).should == [true, false]
end
it "returns an empty array when passed count on an empty array" do
[].first(0).should == []
[].first(1).should == []
[].first(2).should == []
end
it "returns an empty array when passed count == 0" do
[1, 2, 3, 4, 5].first(0).should == []
end
it "returns an array containing the first element when passed count == 1" do
[1, 2, 3, 4, 5].first(1).should == [1]
end
it "returns the entire array when count > length" do
[1, 2, 3, 4, 5, 9].first(10).should == [1, 2, 3, 4, 5, 9]
end
it "returns an array which is independent to the original when passed count" do
ary = [1, 2, 3, 4, 5]
ary.first(0).replace([1, 2])
[1, 2, 3, 4, 5].should == ary
ary.first(1).replace([1, 2])
[1, 2, 3, 4, 5].should == ary
ary.first(6).replace([1, 2])
[1, 2, 3, 4, 5].should == ary
end
it "is not destructive" do
a = [1, 2, 3]
a.first
a.should == [1, 2, 3]
a.first(2)
a.should == [1, 2, 3]
a.first(3)
a.should == [1, 2, 3]
end
end
Version data entries
23 entries across 23 versions & 1 rubygems