iif

iif(cond, trueResult, falseResult)

cond is a Boolean scalar/vector/matrix. It can be an expression returning Boolean values.

trueResult and falseResult are scalars, or vectors of the same length as cond, or matrices of the same dimensions as cond.

Element-wise conditional operation. cond is of Boolean type. If cond[i] is true, it returns trueResult(cond[i]); otherwise it returns falseResult(cond[i]). If cond[i] is NULL, it returns NULL.

iif(true true true false false false, 1..6, 6..1);
// output
[1,2,3,3,2,1]

iif(1..6==3, 1, 2);
// output
[2,2,1,2,2,2]

x=9 6 8;
iif(x<=8, 10*x, 20*x-80);
// output
[100,60,80]

Use function iif in a SQL statement:

t=table(1..5 as id, 11..15 as x);
t1=table(take(12,5) as a, take(14,5) as b);
t;

t1;

update t set x=iif(x<t1.a, t1.a, iif(x>t1.b,t1.b, x));
t;

a = NULL 1 -3 5
iif(a > 0, a, 0)
// output
[0, 1, 0, 5]

iif(nullCompare(>,a,0), a, 0)
// output
[ , 1, 0, 5]

m1=1..6$3:2
m2=6..1$3:2
iif(m1>m2, m1, m2);