[Beta] fix warning-keys (#4977)

3 years ago · 102982abd2
1 changed files with 3 additions and 1 deletions
--- a/beta/src/pages/learn/updating-arrays-in-state.md
+++ b/beta/src/pages/learn/updating-arrays-in-state.md
@ -255,7 +255,9 @@ export default function ShapeEditor() {
        Move circles down!
      </button>
      {shapes.map(shape => (
-        <div style={{
+        <div
+          key={shape.id}
+          style={{
          background: 'purple',
          position: 'absolute',
          left: shape.x,