Permutations: Difference between revisions
Content added Content deleted
(→{{header|Perl 6}}: modernize a bit) |
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// [a] -> [[a]] |
// [a] -> [[a]] |
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function permutations(xs) { |
function permutations(xs) { |
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return xs.length ? ( |
return xs.length ? (chain(xs, function (x) { |
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return chain(permutations(deleted(x, xs)), function (ys) { |
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return |
return ([[x].concat(ys)]); |
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| ⚫ | |||
})) : [[]] |
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})})) : [[]] |
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} |
} |
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// drops first instance found |
// drops first instance found |
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function deleted(x, xs) { |
function deleted(x, xs) { |
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return xs.length ? ( |
return xs.length ? x === xs[0] ? xs.slice(1) : [xs[0]] |
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x |
.concat(deleted(x, xs.slice(1))) : []; |
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deleted(x, xs.slice(1)) |
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| ⚫ | |||
) : []; |
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} |
} |
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{{out}} |
{{out}} |
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<lang JavaScript>[["Aardvarks", "eat", "ants"], ["Aardvarks", "ants", "eat"], |
<lang JavaScript>[["Aardvarks", "eat", "ants"], ["Aardvarks", "ants", "eat"], |
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["eat", "Aardvarks", "ants"], ["eat", "ants", "Aardvarks"], |
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["ants", "Aardvarks", "eat"], ["ants", "eat", "Aardvarks"]]</lang> |
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=={{header|jq}}== |
=={{header|jq}}== |
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