Function setValue

packages/react-stately/src/select/useSelectState.ts:180–197

(value: Key | Key[] | null)

      ? controlledValue[0]
      : controlledValue;
  let setValue = (value: Key | Key[] | null) => {
    if (selectionMode === 'single') {
      let key = Array.isArray(value) ? (value[0] ?? null) : value;
      setControlledValue(key);
      if (key !== displayValue) {
        props.onSelectionChange?.(key);
      }
    } else {
      let keys: Key[] = [];
      if (Array.isArray(value)) {
        keys = value;
      } else if (value != null) {
        keys = [value];
      }

      setControlledValue(keys);
    }
  };

  let listState = useListState({
    ...props,