From 8e4f5dd97ba1941b6b4f6e2fef8e21485ff9c8b9 Mon Sep 17 00:00:00 2001
From: Suhail Patel <me@suhailpatel.com>
Date: Sun, 23 Jun 2019 23:16:04 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=A6=85=20Pre-allocate=20size=20of=20the?=
 =?UTF-8?q?=20list=20for=20struct=20fields?=
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---
 scanner.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/scanner.go b/scanner.go
index 766f458..e66233d 100644
--- a/scanner.go
+++ b/scanner.go
@@ -118,13 +118,13 @@ func (s *scanner) structFields(structType reflect.Type) ([]*r.Field, error) {
 		return nil, fmt.Errorf("could not decode struct of type %T", fmPtr)
 	}
 
-	structFields := []*r.Field{}
-	for _, fieldName := range s.stmt.fieldNames {
+	structFields := make([]*r.Field, len(s.stmt.fieldNames))
+	for i, fieldName := range s.stmt.fieldNames {
 		field, ok := m[strings.ToLower(fieldName)]
 		if !ok { // the field doesn't have a destination
-			structFields = append(structFields, nil)
+			structFields[i] = nil
 		} else {
-			structFields = append(structFields, &field)
+			structFields[i] = &field
 		}
 	}
 	return structFields, nil