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隣り合う二項の差 (Nested Flatten)

Factor です。2map で。

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USING: kernel math sequences ;

: diff ( seq -- newseq )
    dup 1 tail swap [ - ] 2map ;

USE: tools.test
[ { -2 3 -3 4 4 -7 4 -1 } ] [ { 3 1 4 1 5 9 2 6 5 } diff ] unit-test

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