Power set: Difference between revisions
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=={{header|JavaScript}}== |
=={{header|JavaScript}}== |
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=== |
===ES5=== |
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====Iteration==== |
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Uses a JSON stringifier from http://www.json.org/js.html |
Uses a JSON stringifier from http://www.json.org/js.html |
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<pre>[[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3],[4],[1,4],[2,4],[1,2,4],[3,4],[1,3,4],[2,3,4],[1,2,3,4]]</pre> |
<pre>[[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3],[4],[1,4],[2,4],[1,2,4],[3,4],[1,3,4],[2,3,4],[1,2,3,4]]</pre> |
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===Functional |
====Functional composition==== |
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{{trans|Haskell}} |
{{trans|Haskell}} |
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"set which contains only the empty set ->":[[], [[]]] |
"set which contains only the empty set ->":[[], [[]]] |
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}</lang> |
}</lang> |
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===ES6=== |
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<lang JavaScript>(() => { |
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'use strict'; |
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// powerset :: [a] -> [[a]] |
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const powerset = xs => |
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xs.reduceRight((a, x) => a.concat(a.map(y => [x].concat(y))), [ |
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[] |
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]); |
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// TEST |
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return { |
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'[1,2,3] ->': powerset([1, 2, 3]), |
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'empty set ->': powerset([]), |
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'set which contains only the empty set ->': powerset([ |
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[] |
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]) |
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}; |
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})()</lang> |
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{{Out}} |
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<lang JavaScript>{"[1,2,3] ->":[[], [3], [2], [2, 3], [1], [1, 3], [1, 2], [1, 2, 3]], |
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"empty set ->":[[]], |
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"set which contains only the empty set ->":[[], [[]]]}</lang> |
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=={{header|jq}}== |
=={{header|jq}}== |
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