In one single Smalltalk line, because we can:
2015 asYear months count: [ :m | (m start asDate + 12 days) dayOfWeek = 6 ]. "return 3" 1986 asYear months count: [ :m | (m start asDate + 12 days) dayOfWeek = 6 ]. "return 1"
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In one single Smalltalk line, because we can: