Sort stability: Difference between revisions
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(→{{header|Ruby}}: documenting difficulties) |
m (→{{header|Ruby}}: link to stable merge sort) |
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# => [["US", "Birmingham"], ["UK", "Birmingham"], ["UK", "London"], ["US", "New York"]]</lang> |
# => [["US", "Birmingham"], ["UK", "Birmingham"], ["UK", "London"], ["US", "New York"]]</lang> |
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So, if we want to use Ruby's <code>sort</code> ''and'' we want stability, we might be better off using |
So, if we want to use Ruby's <code>sort</code> ''and'' we want stability, we might be better off using [[Merge sort]] or a Schwartzian transform: |
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<lang ruby> |
<lang ruby>ary.each_index \ |
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ary.each_index \ |
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.map {|i| ary[i] + [i]} \ |
.map {|i| ary[i] + [i]} \ |
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.sort {|a,b| (a[1] <=> b[1]).nonzero? or a[-1] <=> b[-1]} \ |
.sort {|a,b| (a[1] <=> b[1]).nonzero? or a[-1] <=> b[-1]} \ |
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