Last Friday of each month: Difference between revisions
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m (→{{header|J}}) |
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=={{header|J}}== |
=={{header|J}}== |
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<lang j>require'dates' |
<lang j>require 'dates' |
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last_fridays=: 12 {. [:({:/.~ }:"1)@(#~ 5 = weekday)@todate (i.366) + todayno@,&1 1</lang> |
last_fridays=: 12 {. [: ({:/.~ }:"1)@(#~ 5 = weekday)@todate (i.366) + todayno@,&1 1</lang> |
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In other words, start from January 1 of the given year, and count forward for 366 days, keeping the |
In other words, start from January 1 of the given year, and count forward for 366 days, keeping the Fridays. Then pick the last remaining day within each represented month (which will be a Friday because we only kept the Fridays). Then pick the first 12 (since on a non-leap year which ends on a Thursday we would get an extra Friday). |
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Example use: |
Example use: |
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