this is wrong! >> a = 1 => 1 >> b = 2 => 2 >> a = 3 unless b==2 => nil >> a => 1 >> a = unless b==2 >> 2 >> end => nil >> a => nil

this is wrong! >> a = 1 => 1 >> b = 2 => 2 >> a = 3 unless b==2 => nil >> a => 1 >> a = unless b==2 >> 2 >> end => nil >> a => nil The difference is in the variable definition semantics, not in the assignment semantics. Please do not spread this misinformation.