new operator 'join'

operator-digest.go

@@ -9,7 +9,7 @@ import (
 	"io"
 )
 
-//-------- map term
+//-------- digest term
 
 func newDigestTerm(tk *Token) (inst *term) {
 	return &term{
@@ -35,7 +35,7 @@ func evalDigest(ctx ExprContext, opTerm *term) (v any, err error) {
 	}
 
 	if it, err = NewIterator(leftValue); err != nil {
-		return nil, fmt.Errorf("left operand of MAP must be an iterable data-source; got %s", TypeName(leftValue))
+		return nil, fmt.Errorf("left operand of DIGEST must be an iterable data-source; got %s", TypeName(leftValue))
 	}
 
 	lastValue = nil