[JavaScript] A few examples of how using named functions can be more useful than anonymous functions.

1-anonymous-click-handler.js

$( '#button' ).on( 'click', function() {
    
    // Do work
    
});

2-named-click-handler.js

function myHandler() {
  // Do work
}

$( '#button' ).on( 'click', myHandler );

3-mayer-theme-customizer.js

(function($) {
	'use strict';

	$(function() {

		toggleSocialIconVisibility( $, '#email-address', 'mayer_email_address' );
		toggleSocialIconVisibility( $, '#twitter', 'mayer_twitter_username' );
		toggleSocialIconVisibility( $, '#facebook', 'mayer_facebook_url' );
		toggleSocialIconVisibility( $, '#pinterest', 'mayer_pinterest_url' );
		toggleSocialIconVisibility( $, '#google-plus', 'mayer_googleplus_url' );
		toggleSocialIconVisibility( $, '#linkedin', 'mayer_linkedin_url' );

		toggleGravatarVisibility( $, '#avatar', 'mayer_display_gravatar' );
		toggleFooterSocialIcons( $, '#social-icons-wrapper', 'mayer_display_footer_social_icons' );

	});

})( jQuery );

4-mayer-theme-customizer-named-function.js

function setupControls( $ ) {
 
  toggleSocialIconVisibility( $, '#email-address', 'mayer_email_address' );
	toggleSocialIconVisibility( $, '#twitter', 'mayer_twitter_username' );
	toggleSocialIconVisibility( $, '#facebook', 'mayer_facebook_url' );
	toggleSocialIconVisibility( $, '#pinterest', 'mayer_pinterest_url' );
	toggleSocialIconVisibility( $, '#google-plus', 'mayer_googleplus_url' );
	toggleSocialIconVisibility( $, '#linkedin', 'mayer_linkedin_url' );

	toggleGravatarVisibility( $, '#avatar', 'mayer_display_gravatar' );
	toggleFooterSocialIcons( $, '#social-icons-wrapper', 'mayer_display_footer_social_icons' );
  
}
  
(function($) {
	'use strict';

	$(function() {
    		setupControls( $ );
	});

})( jQuery );