Easy as { 1 2 3 }? (when { 1 2 3 } ≠ { 1 2 3 })

[DavidM]

(07-17-2018 01:06 PM)rprosperi Wrote:  

(07-17-2018 12:43 PM)Eddie W. Shore Wrote:  Let me see if I understand this correctly:

SAME compares exact values while Equals (==) compares floating point numerical equivalents?

No, SAME checks if the arguments are actually exactly the same (hence the name), while == tests if the arguments are equivalent.

(1/3) (2/6) SAME => 0. because they are not the same, while

(1/3) (2/6) == => 1. because they are equivalent.

== also ignores tags, which can be useful at times. But the increased flexibility of == comes with a price: it is noticeably slower. So in cases where performance is an issue, it's better to use SAME if you know that the objects in question are compatible with its strictness. In my experience, the most common issue that comes up for compatibility is exact vs. approximate numbers.