simplify

packages/svelte/src/compiler/phases/3-transform/client/visitors/template.js

@@ -3049,11 +3049,9 @@ export const template_visitors = {
 					call_expr = b.call(`$.bind_focused`, state.node, setter);
 					break;
 				case 'group': {
-					/** @type {CallExpression[]} */
-					const indexes = [];
-					for (const parent_each_block of node.metadata.parent_each_blocks) {
-						indexes.push(b.call('$.unwrap', parent_each_block.metadata.index));
-					}
+					const indexes = node.metadata.parent_each_blocks.map((each) => {
+						return b.call('$.unwrap', each.metadata.index);
+					});
 
 					// We need to additionally invoke the value attribute signal to register it as a dependency,
 					// so that when the value is updated, the group binding is updated

packages/svelte/src/internal/client/dom/elements/bindings/input.js

@@ -73,13 +73,8 @@ export function bind_group(inputs, group_index, input, get_value, update) {
 
 	if (group_index !== null) {
 		for (var index of group_index) {
-			var group = binding_group;
-			// @ts-ignore
-			binding_group = group[index];
-			if (binding_group === undefined) {
-				// @ts-ignore
-				binding_group = group[index] = [];
-			}
+			// @ts-expect-error
+			binding_group = binding_group[index] ??= [];
 		}
 	}