Custom sort?

[Albert Chan]

(01-20-2019 11:38 PM)Didier Lachieze Wrote:  In CAS :
sort({{1,2},{2,2.5},{3,1.5}},(x,y)->when(x[2] = y[2],x[1]>y[1],x[2]>y[2]))

Playing with the key compare function, noticed an odd behavior.
X-Cas logical operators (and, or) have the same precedence.

a and b or c => (a and b) or c
a or b and c => (a or b) and c

So, above compare function using logical operator need an extra parenthesis:

(x,y) -> x[2]>y[2] or (x[2]==y[2] and x[1]>y[1])