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Contents
require 'roqua/core_ext/array/stable_sort_by'
describe Array do
describe "#stable_sort_by" do
it "wraps #sort" do
array = []
array.should_receive(:sort)
array.stable_sort_by
end
it "sorts nil values before all others" do
[1, nil, 3].stable_sort_by.should == [nil, 1, 3]
end
it "defaults to regular comparison" do
[1, 3, 2].stable_sort_by.should == [1, 2, 3]
end
it "accepts a block to do complex comparison" do
[{a: 2, b: 2, c: 3},
{a: 2, b: 2, c: 4},
{a: 1, b: 1, c: 6}].stable_sort_by do |x, y|
[x[:a], x[:b], x[:c]] <=> [y[:a], y[:b], y[:c]]
end.should == [{a: 1, b: 1, c: 6},
{a: 2, b: 2, c: 3},
{a: 2, b: 2, c: 4}]
end
it "leaves items in original order if they are the same" do
[{a: 2, b: 2, c: 4},
{a: 2, b: 1, c: 3},
{a: 1, b: 3, c: 6}].sort do |x, y|
[x[:a], x[:b]] <=> [y[:a], y[:b]]
end.should == [{a: 1, b: 3, c: 6},
{a: 2, b: 1, c: 3},
{a: 2, b: 2, c: 4}]
end
end
end
Version data entries
37 entries across 37 versions & 1 rubygems