builtin: add Append()

function61 · Dec 19, 2024 · f0ce2a6 · f0ce2a6
1 parent 62ba159
commit f0ce2a6
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Showing 2 changed files with 16 additions and 0 deletions.
diff --git a/builtin/builtin.go b/builtin/builtin.go
@@ -80,3 +80,9 @@ func Must[T any](value T, err error) T {
 func FirstError(errs ...error) error {
 	return FirstNonEmpty(errs...)
 }
+
+
+// append to a slice without needing the "assign to same variable" boilerplate
+func Append[T any](slice *[]T, item T) {
+	*slice = append(*slice, item)
+}
diff --git a/builtin/builtin_test.go b/builtin/builtin_test.go
@@ -3,6 +3,7 @@ package builtin
 import (
 	"context"
 	"errors"
+	"strings"
 	"testing"
 
 	"github.com/function61/gokit/testing/assert"
@@ -76,3 +77,12 @@ func TestFirstNonEmptyWithError(t *testing.T) {
 	assert.EqualString(t, FirstNonEmpty(nilError, actualError).Error(), "actual")
 	assert.Assert(t, FirstNonEmpty(nilError, nilError) == nil)
 }
+
+func TestAppend(t *testing.T) {
+	favoriteThings := []string{"hamburger"}
+
+	Append(&favoriteThings, "food")
+	Append(&favoriteThings, "bar")
+
+	assert.EqualString(t, strings.Join(favoriteThings, ", "), "hamburger, food, bar")
+}