WooCommerce set default city on checkout

functions.php

/**
 * @snippet       WooCommerce Set Default City @ Checkout
 * @how-to        Get CustomizeWoo.com FREE
 * @sourcecode    https://businessbloomer.com/?p=21223
 * @author        Rodolfo Melogli
 * @testedwith    WooCommerce 3.4.6
 */
 
add_filter( 'woocommerce_checkout_fields', 'bbloomer_set_checkout_field_input_value_default' );
 
function bbloomer_set_checkout_field_input_value_default($fields) {
    $fields['billing']['billing_city']['default'] = 'London';
    return $fields;
}