ternary
The ternary function takes two values, and a test value. If the test value is
true, the first value will be returned. If the test value is empty, the second
value will be returned. This is similar to the c ternary operator.
ternary "foo" "bar" true
or
true | ternary "foo" "bar"
The above returns "foo".
ternary "foo" "bar" false
or
false | ternary "foo" "bar"
The above returns "bar".