Hygiene: Use early returns in a few places for special cases

When handling special cases that are logically distinct from
the function's main branch, it improves code quality (through
readability and maintainability) to place those first and with
an early return.

The has the benefit of the main return statement being easy to
find at the end of the function. (Not early and/or in a block).

It also means when working on the code, there is generally a
less complexity and fewer nesting levels, given that most code
is in the main branch. This makes is easier and quicker to verify
that code does what it should, as well as making it easy to
extend in the future. When considering to add code to end of a
function's main scope, it should relate to the function's main
branch by default, not a special case. For example, a getName()
method should not end with a top-level statement 'return false'
(unless it is a stub). Rather, one would expect it to end with
`return name`.

Change-Id: I1f3088f2409c82dd3bf757fc8fa27dc97ae2767b

resources/skins.minerva.editor/init.js

@@ -152,9 +152,8 @@
 			// visualEditorDefault = veConfig && veConfig.defaultUserOptions && veConfig.defaultUserOptions.enable;
 			// return visualEditorDefault ? 'VisualEditor' : 'SourceEditor';
 			return 'SourceEditor';
-		} else {
-			return preferredEditor;
 		}
+		return preferredEditor;
 	}
 
 	/**
@@ -416,7 +415,9 @@
 		// Only load the wikitext editor on wikitext. Otherwise we'll rely on the fallback behaviour
 		// (You can test this on MediaWiki:Common.css) ?action=edit url (T173800)
 		return;
-	} else if ( !isEditingSupported ) {
+	}
+
+	if ( !isEditingSupported ) {
 		// Editing is disabled (or browser is blacklisted)
 		updateEditPageButton( false );
 		showSorryToast( mw.msg( 'mobile-frontend-editor-unavailable' ) );

resources/skins.minerva.scripts/init.js

@@ -133,15 +133,15 @@
 			// This means MultimediaViewer has been installed and is loaded.
 			// Avoid loading it (T169622)
 			return $.Deferred().reject();
-		} else if ( mw.loader.getState( 'mobile.mediaViewer' ) === 'ready' ) {
+		}
+		if ( mw.loader.getState( 'mobile.mediaViewer' ) === 'ready' ) {
 			// If module already loaded, do this synchronously to avoid the event loop causing
 			// a visible flash (see T197110)
 			return makeImageOverlay( title );
-		} else {
-			return loader.loadModule( 'mobile.mediaViewer' ).then( function () {
-				return makeImageOverlay( title );
-			} );
 		}
+		return loader.loadModule( 'mobile.mediaViewer' ).then( function () {
+			return makeImageOverlay( title );
+		} );
 	}
 
 	// Routes

resources/skins.minerva.scripts/pageIssues.js

@@ -218,19 +218,18 @@
 	 * @return {jQuery.Object[]} array of all issues.
 	 */
 	function getIssues( section ) {
-		if ( section === KEYWORD_ALL_SECTIONS ) {
-			// Note section.all may not exist, depending on the structure of the HTML page.
-			// It will only exist when Minerva has been run in desktop mode.
-			// If it's absent, we'll reduce all the other lists into one.
-			return allIssues.all || Object.keys( allIssues ).reduce(
-				function ( all, key ) {
-					return all.concat( allIssues[key] );
-				},
-				[]
-			);
-		} else {
+		if ( section !== KEYWORD_ALL_SECTIONS ) {
 			return allIssues[section] || [];
 		}
+		// Note section.all may not exist, depending on the structure of the HTML page.
+		// It will only exist when Minerva has been run in desktop mode.
+		// If it's absent, we'll reduce all the other lists into one.
+		return allIssues.all || Object.keys( allIssues ).reduce(
+			function ( all, key ) {
+				return all.concat( allIssues[key] );
+			},
+			[]
+		);
 	}
 
 	/**