Javascript shorty
matchingDayCount = (year, dayOfMonth=13, dayOfWeek=5) => [...Array(12)].reduce((acc, _, month) => acc + Number(new Date(year, month, dayOfMonth).getDay() == dayOfWeek), 0) [2015, 1986].map(y => matchingDayCount(y)).join() // >> 3,1
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Javascript shorty