// a represents a range with values 1,2,3 var a = 1...3; // b represents a range with values 1,2 var b = 1..<3; Ah! I wish they had gone for 1..3 and 1>..3

// a represents a range with values 1,2,3 var a = 1...3; // b represents a range with values 1,2 var b = 1..<3; Ah! I wish they had gone for 1..3 and 1>..3 and 1..<3 and 1>..<3 to make it easy to understand. The above would map to [1,2,3], [2,3], [1,2] and [2] respectively. Range operator quirks with ... and .. have to today be memorized and waste developer seconds that add up to man-years.