feat: migrate projects

src/components/CustomRoadmap/FlowRoadmapRenderer.tsx

@@ -159,7 +159,8 @@ export function FlowRoadmapRenderer(props: FlowRoadmapRendererProps) {
       {hideRenderer && (
         <EmptyRoadmap
           roadmapId={roadmapId}
-          canManage={roadmap.canManage}
+          // @ts-ignore
+          canManage={roadmap?.canManage}
           className="grow"
         />
       )}

src/components/Guide/GuideContent.astro

@@ -40,7 +40,7 @@ const { data: guideFrontmatter, author } = guide;
       </h1>
       <p class='my-0 flex items-center justify-start text-sm text-gray-400'>
         <a
-          href={`/authors/${author.id}`}
+          href={`/authors/${author.slug}`}
           class='inline-flex items-center font-medium underline-offset-2 hover:text-gray-600 hover:underline'
         >
           <img
@@ -53,7 +53,7 @@ const { data: guideFrontmatter, author } = guide;
         <span class='mx-2 hidden sm:inline'>&middot;</span>
         <a
           class='hidden underline-offset-2 hover:text-gray-600 sm:inline'
-          href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/guides/${guide.id}.md`}
+          href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/guides/${guide.slug}.md`}
           target='_blank'
         >
           Improve this Guide

src/components/GuideHeader.astro

@@ -7,7 +7,7 @@ export interface Props {
 }
 
 const { guide } = Astro.props;
-const { frontmatter, author } = guide;
+const { data: frontmatter, author } = guide;
 
 return undefined;
 ---
@@ -18,18 +18,18 @@ return undefined;
       class='hidden items-center justify-start text-gray-400 sm:flex sm:justify-center'
     >
       {
-        author?.frontmatter && (
+        author?.data && (
           <>
             <a
-              href={`/authors/${author.id}`}
+              href={`/authors/${author.slug}`}
               class='inline-flex items-center font-medium hover:text-gray-600 hover:underline'
             >
               <img
-                alt={author.frontmatter.name}
+                alt={author.data.name}
-                src={author.frontmatter.imageUrl}
+                src={author.data.imageUrl}
                 class='mr-2 inline h-5 w-5 rounded-full'
               />
-              {author.frontmatter.name}
+              {author.data.name}
             </a>
             <span class='mx-1.5'>&middot;</span>
           </>
@@ -39,7 +39,7 @@ return undefined;
       <span class='mx-1.5'>&middot;</span>
       <a
         class='text-blue-400 hover:text-blue-500 hover:underline'
-        href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/guides/${guide.id}.md`}
+        href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/guides/${guide.slug}.md`}
         target='_blank'>Improve this Guide</a
       >
     </p>

src/components/Projects/ListProjectSolutions.tsx

@@ -14,8 +14,7 @@ import { showLoginPopup } from '../../lib/popup';
 import { VoteButton } from './VoteButton.tsx';
 import { GitHubIcon } from '../ReactIcons/GitHubIcon.tsx';
 import { SelectLanguages } from './SelectLanguages.tsx';
-import type { ProjectFrontmatter } from '../../lib/project.ts';
+import type { ProjectFileType } from '../../lib/project.ts';
-import { ProjectSolutionModal } from './ProjectSolutionModal.tsx';
 
 export interface ProjectStatusDocument {
   _id?: string;
@@ -65,7 +64,7 @@ type PageState = {
 };
 
 type ListProjectSolutionsProps = {
-  project: ProjectFrontmatter;
+  project: ProjectFileType['data'];
   projectId: string;
 };
 

src/components/Projects/ProjectCard.tsx

@@ -1,10 +1,8 @@
 import { Badge } from '../Badge.tsx';
-import type {
+import type { ProjectFileType } from '../../lib/project.ts';
-  ProjectDifficultyType,
-  ProjectFileType,
-} from '../../lib/project.ts';
 import { Users } from 'lucide-react';
 import { formatCommaNumber } from '../../lib/number.ts';
+import type { ProjectDifficultyType } from '../../content/project.ts';
 
 type ProjectCardProps = {
   project: ProjectFileType;
@@ -20,7 +18,7 @@ const badgeVariants: Record<ProjectDifficultyType, string> = {
 export function ProjectCard(props: ProjectCardProps) {
   const { project, userCount = 0 } = props;
 
-  const { frontmatter, id } = project;
+  const { data: frontmatter, slug: id } = project;
 
   return (
     <a

src/components/Projects/ProjectsList.tsx

@@ -2,16 +2,16 @@ import { ProjectCard } from './ProjectCard.tsx';
 import { HeartHandshake, Trash2 } from 'lucide-react';
 import { cn } from '../../lib/classname.ts';
 import { useMemo, useState } from 'react';
-import {
+import { type ProjectFileType } from '../../lib/project.ts';
-  projectDifficulties,
-  type ProjectDifficultyType,
-  type ProjectFileType,
-} from '../../lib/project.ts';
 import {
   deleteUrlParam,
   getUrlParams,
   setUrlParams,
 } from '../../lib/browser.ts';
+import {
+  projectDifficulties,
+  type ProjectDifficultyType,
+} from '../../content/project.ts';
 
 type DifficultyButtonProps = {
   difficulty: ProjectDifficultyType;
@@ -56,7 +56,7 @@ export function ProjectsList(props: ProjectsListProps) {
       const result = new Map<ProjectDifficultyType, ProjectFileType[]>();
 
       for (const project of projects) {
-        const difficulty = project.frontmatter.difficulty;
+        const difficulty = project.data.difficulty;
 
         if (!result.has(difficulty)) {
           result.set(difficulty, []);
@@ -78,6 +78,7 @@ export function ProjectsList(props: ProjectsListProps) {
         <div className="flex flex-wrap gap-1">
           {projectDifficulties.map((projectDifficulty) => (
             <DifficultyButton
+              key={projectDifficulty}
               onClick={() => {
                 setDifficulty(projectDifficulty);
                 setUrlParams({ difficulty: projectDifficulty });
@@ -119,18 +120,24 @@ export function ProjectsList(props: ProjectsListProps) {
 
         {matchingProjects
           .sort((project) => {
-            return project.frontmatter.difficulty === 'beginner'
+            return project.data.difficulty === 'beginner'
               ? -1
-              : project.frontmatter.difficulty === 'intermediate'
+              : project.data.difficulty === 'intermediate'
                 ? 0
                 : 1;
           })
           .sort((a, b) => {
-            return a.frontmatter.sort - b.frontmatter.sort;
+            return a.data.sort - b.data.sort;
           })
           .map((matchingProject) => {
-            const count = userCounts[matchingProject?.id] || 0;
+            const count = userCounts[matchingProject?.slug] || 0;
-            return <ProjectCard project={matchingProject} userCount={count} />;
+            return (
+              <ProjectCard
+                key={matchingProject.slug}
+                project={matchingProject}
+                userCount={count}
+              />
+            );
           })}
       </div>
     </div>

src/components/Projects/ProjectsPage.tsx

@@ -7,11 +7,9 @@ import {
   setUrlParams,
 } from '../../lib/browser.ts';
 import { CategoryFilterButton } from '../Roadmaps/CategoryFilterButton.tsx';
-import {
+import { type ProjectFileType } from '../../lib/project.ts';
-  projectDifficulties,
-  type ProjectFileType,
-} from '../../lib/project.ts';
 import { ProjectCard } from './ProjectCard.tsx';
+import { projectDifficulties } from '../../content/project.ts';
 
 type ProjectGroup = {
   id: string;
@@ -28,7 +26,7 @@ export function ProjectsPage(props: ProjectsPageProps) {
   const { roadmapsProjects, userCounts } = props;
   const allUniqueProjectIds = new Set<string>(
     roadmapsProjects.flatMap((group) =>
-      group.projects.map((project) => project.id),
+      group.projects.map((project) => project.slug),
     ),
   );
   const allUniqueProjects = useMemo(
@@ -37,7 +35,7 @@ export function ProjectsPage(props: ProjectsPageProps) {
         .map((id) =>
           roadmapsProjects
             .flatMap((group) => group.projects)
-            .find((project) => project.id === id),
+            .find((project) => project.slug === id),
         )
         .filter(Boolean) as ProjectFileType[],
     [allUniqueProjectIds],
@@ -67,8 +65,8 @@ export function ProjectsPage(props: ProjectsPageProps) {
   const sortedVisibleProjects = useMemo(
     () =>
       visibleProjects.sort((a, b) => {
-        const projectADifficulty = a?.frontmatter.difficulty || 'beginner';
+        const projectADifficulty = a?.data.difficulty || 'beginner';
-        const projectBDifficulty = b?.frontmatter.difficulty || 'beginner';
+        const projectBDifficulty = b?.data.difficulty || 'beginner';
         return (
           projectDifficulties.indexOf(projectADifficulty) -
           projectDifficulties.indexOf(projectBDifficulty)
@@ -189,7 +187,7 @@ export function ProjectsPage(props: ProjectsPageProps) {
               <ProjectCard
                 key={project.id}
                 project={project}
-                userCount={userCounts[project.id] || 0}
+                userCount={userCounts[project.slug] || 0}
               />
             ))}
           </div>

src/components/Questions/QuestionGuide.astro

@@ -80,7 +80,7 @@ const { data: guideFrontmatter, author } = questionGroup;
         author && (
           <p class='my-0 flex items-center justify-start text-sm text-gray-400'>
             <a
-              href={`/authors/${author?.id}`}
+              href={`/authors/${author?.slug}`}
               class='inline-flex items-center font-medium underline-offset-2 hover:text-gray-600 hover:underline'
             >
               <img
@@ -93,7 +93,7 @@ const { data: guideFrontmatter, author } = questionGroup;
             <span class='mx-2 hidden sm:inline'>&middot;</span>
             <a
               class='hidden underline-offset-2 hover:text-gray-600 sm:inline'
-              href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/question-groups/${questionGroup.id}`}
+              href={`https://github.com/kamranahmedse/developer-roadmap/tree/master/src/data/question-groups/${questionGroup.slug}`}
               target='_blank'
             >
               Improve this Guide
@@ -110,7 +110,7 @@ const { data: guideFrontmatter, author } = questionGroup;
       </p>
       <div class='mx-0 sm:-mb-32'>
         <QuestionsList
-          groupId={questionGroup.id}
+          groupId={questionGroup.slug}
           questions={questionGroup.questions}
           client:load
         />

src/components/VideoHeader.astro

@@ -1,6 +1,5 @@
 ---
 import type { VideoFileType } from '../lib/video';
-import YouTubeAlert from './YouTubeAlert.astro';
 
 export interface Props {
   video: VideoFileType;
@@ -16,15 +15,15 @@ const { frontmatter, author } = video;
       class='hidden items-center justify-start text-gray-400 sm:flex sm:justify-center'
     >
       <a
-        href={`/authors/${author.id}`}
+        href={`/authors/${author.slug}`}
         class='inline-flex items-center font-medium hover:text-gray-600 hover:underline'
       >
         <img
-          alt={author.frontmatter.name}
+          alt={author.data.name}
-          src={author.frontmatter.imageUrl}
+          src={author.data.imageUrl}
           class='mr-2 inline h-5 w-5 rounded-full'
         />
-        {author.frontmatter.name}
+        {author.data.name}
       </a>
       <span class='mx-1.5'>&middot;</span>
       <span class='capitalize'>Illustrated Video</span>

src/content/config.ts

@@ -1,9 +1,11 @@
 import { authorCollection } from './author';
 import { guideCollection } from './guide';
+import { projectCollection } from './project';
 import { questionGroupCollection } from './question-group';
 
 export const collections = {
   authors: authorCollection,
   guides: guideCollection,
   'question-groups': questionGroupCollection,
+  projects: projectCollection,
 };

src/content/project.ts

@@ -0,0 +1,28 @@
+import { defineCollection, z } from 'astro:content';
+
+export const projectDifficulties = [
+  'beginner',
+  'intermediate',
+  'advanced',
+] as const;
+export type ProjectDifficultyType = (typeof projectDifficulties)[number];
+
+export const projectCollection = defineCollection({
+  type: 'content',
+  schema: z.object({
+    title: z.string(),
+    description: z.string(),
+    isNew: z.boolean(),
+    sort: z.number(),
+    difficulty: z.enum(projectDifficulties),
+    nature: z.string(),
+    skills: z.array(z.string()),
+    seo: z.object({
+      title: z.string(),
+      description: z.string(),
+      keywords: z.array(z.string()),
+      ogImageUrl: z.string().optional(),
+    }),
+    roadmapIds: z.array(z.string()),
+  }),
+});

src/content/projects/temperature-converter.md

@@ -11,9 +11,9 @@ skills:
   - JavaScript
   - DOM Manipulation
 seo:
-  - title: Build a Temperature Converter with JavaScript
+  title: Build a Temperature Converter with JavaScript
-  - description: Learn how to create an interactive temperature converter that converts between Celsius, Fahrenheit, and Kelvin using JavaScript.
+  description: Learn how to create an interactive temperature converter that converts between Celsius, Fahrenheit, and Kelvin using JavaScript.
-  - keywords:
+  keywords:
     - 'temperature converter'
     - 'javascript project'
     - 'unit conversion'

src/lib/project.ts

@@ -1,54 +1,17 @@
-import type { MarkdownFileType } from './file';
+import { getCollection, type CollectionEntry } from 'astro:content';
 import { getRoadmapById, type RoadmapFileType } from './roadmap.ts';
 
-export const projectDifficulties = [
+export type ProjectFileType = CollectionEntry<'projects'> & {
-  'beginner',
-  'intermediate',
-  'advanced',
-] as const;
-export type ProjectDifficultyType = (typeof projectDifficulties)[number];
-
-export interface ProjectFrontmatter {
-  title: string;
-  description: string;
-  isNew: boolean;
-  sort: number;
-  difficulty: ProjectDifficultyType;
-  nature: string;
-  skills: string[];
-  seo: {
-    title: string;
-    description: string;
-    keywords: string[];
-    ogImageUrl: string;
-  };
-  roadmapIds: string[];
-}
-
-export type ProjectFileType = MarkdownFileType<ProjectFrontmatter> & {
-  id: string;
   roadmaps: RoadmapFileType[];
 };
 
-/**
- * Generates id from the given project file
- * @param filePath Markdown file path
- *
- * @returns unique project identifier
- */
-function projectPathToId(filePath: string): string {
-  const fileName = filePath.split('/').pop() || '';
-
-  return fileName.replace('.md', '');
-}
-
 export async function getProjectsByRoadmapId(
   roadmapId: string,
 ): Promise<ProjectFileType[]> {
   const projects = await getAllProjects();
 
   return projects.filter((project) =>
-    project.frontmatter?.roadmapIds?.includes(roadmapId),
+    project.data?.roadmapIds?.includes(roadmapId),
   );
 }
 
@@ -63,26 +26,20 @@ export async function getAllProjects(): Promise<ProjectFileType[]> {
     return tempProjects;
   }
 
-  const projects = import.meta.glob<ProjectFileType>(
+  tempProjects = await getCollection('projects');
-    '/src/data/projects/*.md',
-    {
-      eager: true,
-    },
-  );
-
-  tempProjects = Object.values(projects).map((projectFile) => ({
-    ...projectFile,
-    id: projectPathToId(projectFile.file),
-  }));
-
   return tempProjects;
 }
 
 export async function getProjectById(
   groupId: string,
 ): Promise<ProjectFileType> {
-  const project = await import(`../data/projects/${groupId}.md`);
+  const projects = await getAllProjects();
-  const roadmapIds = project.frontmatter.roadmapIds || [];
+  const project = projects.find((project) => project.slug === groupId);
+  if (!project) {
+    throw new Error(`Project not found with id: ${groupId}`);
+  }
+
+  const roadmapIds = project.data.roadmapIds || [];
   const roadmaps = await Promise.all(
     roadmapIds.map((roadmapId: string) => getRoadmapById(roadmapId)),
   );
@@ -90,7 +47,6 @@ export async function getProjectById(
   return {
     ...project,
     roadmaps: roadmaps,
-    id: projectPathToId(project.file),
   };
 }
 
@@ -101,7 +57,7 @@ export async function getRoadmapsProjects(): Promise<
   const roadmapsProjects: Record<string, ProjectFileType[]> = {};
 
   projects.forEach((project) => {
-    project.frontmatter.roadmapIds.forEach((roadmapId) => {
+    project.data.roadmapIds.forEach((roadmapId) => {
       if (!roadmapsProjects[roadmapId]) {
         roadmapsProjects[roadmapId] = [];
       }

src/lib/video.ts

@@ -44,7 +44,7 @@ export async function getVideosByAuthor(
 ): Promise<VideoFileType[]> {
   const allVideos = await getAllVideos();
 
-  return allVideos.filter((video) => video.author?.id === authorId);
+  return allVideos.filter((video) => video.author?.slug === authorId);
 }
 
 /**
@@ -63,7 +63,7 @@ export async function getAllVideos(): Promise<VideoFileType[]> {
     ...videoFile,
     id: videoPathToId(videoFile.file),
     author: allAuthors.find(
-      (author) => author.id === videoFile.frontmatter.authorId,
+      (author) => author.slug === videoFile.frontmatter.authorId,
     )!,
   }));
 

src/pages/[roadmapId]/projects.astro

@@ -52,7 +52,7 @@ const nounTitle =
 const seoDescription = `Seeking ${nounTitle.toLowerCase()} projects to enhance your skills? Explore our top 20 project ideas, from simple apps to complex systems. Start building today!`;
 
 const projects = await getProjectsByRoadmapId(roadmapId);
-const projectIds = projects.map((project) => project.id);
+const projectIds = projects.map((project) => project.slug);
 
 const projectApiClient = projectApi(Astro);
 const { response: userCounts } =

src/pages/authors/[authorId].astro

@@ -32,7 +32,7 @@ const videos = await getVideosByAuthor(authorId);
 ---
 
 <BaseLayout
-  permalink={`/authors/${author.id}`}
+  permalink={`/authors/${author.slug}`}
   title={`${authorFrontmatter.name} - Author at roadmap.sh`}
   briefTitle={authorFrontmatter.name}
   ogImageUrl={`https://roadmap.sh/${authorFrontmatter.imageUrl}`}

src/pages/index.astro

@@ -93,7 +93,7 @@ const videos = await getAllVideos();
       allowBookmark={false}
       featuredItems={questionGroups.map((questionGroup) => ({
         text: questionGroup.data.briefTitle,
-        url: `/questions/${questionGroup.id}`,
+        url: `/questions/${questionGroup.slug}`,
         isNew: questionGroup.data.isNew,
       }))}
     />

src/pages/pages.json.ts

@@ -34,16 +34,16 @@ export async function GET() {
         group: 'Best Practices',
       })),
       ...questionGroups.map((questionGroup) => ({
-        id: questionGroup.id,
+        id: questionGroup.slug,
-        url: `/questions/${questionGroup.id}`,
+        url: `/questions/${questionGroup.slug}`,
         title: questionGroup.data.briefTitle,
         group: 'Questions',
       })),
       ...guides.map((guide) => ({
-        id: guide.id,
+        id: guide.slug,
         url: guide.data.excludedBySlug
           ? guide.data.excludedBySlug
-          : `/guides/${guide.id}`,
+          : `/guides/${guide.slug}`,
         title: guide.data.title,
         description: guide.data.description,
         authorId: guide.data.authorId,
@@ -56,10 +56,10 @@ export async function GET() {
         group: 'Videos',
       })),
       ...projects.map((project) => ({
-        id: project.id,
+        id: project.slug,
-        url: `/projects/${project.id}`,
+        url: `/projects/${project.slug}`,
-        title: project.frontmatter.title,
+        title: project.data.title,
-        description: project.frontmatter.description,
+        description: project.data.description,
         group: 'Projects',
       })),
     ]),

src/pages/projects/[projectId]/index.astro

@@ -1,11 +1,7 @@
 ---
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { Badge } from '../../../components/Badge';
-import {
+import { getAllProjects, getProjectById } from '../../../lib/project';
-  getAllProjects,
-  getProjectById,
-  type ProjectFrontmatter,
-} from '../../../lib/project';
 import AstroIcon from '../../../components/AstroIcon.astro';
 import { ProjectStepper } from '../../../components/Projects/StatusStepper/ProjectStepper';
 import { ProjectTabs } from '../../../components/Projects/ProjectTabs';
@@ -14,7 +10,7 @@ export async function getStaticPaths() {
   const projects = await getAllProjects();
 
   return projects
-    .map((project) => project.id)
+    .map((project) => project.slug)
     .map((projectId) => ({
       params: { projectId },
     }));
@@ -27,7 +23,8 @@ interface Params extends Record<string, string | undefined> {
 const { projectId } = Astro.params as Params;
 
 const project = await getProjectById(projectId);
-const projectData = project.frontmatter as ProjectFrontmatter;
+const projectData = project.data;
+const { Content } = await project.render();
 
 let jsonLdSchema: any[] = [];
 
@@ -49,7 +46,11 @@ const parentRoadmapId = projectData?.roadmapIds?.[0] || '';
 >
   <div class='bg-gray-50'>
     <div class='container'>
-      <ProjectTabs parentRoadmapId={parentRoadmapId} projectId={projectId} activeTab='details' />
+      <ProjectTabs
+        parentRoadmapId={parentRoadmapId}
+        projectId={projectId}
+        activeTab='details'
+      />
 
       <div
         class='mb-4 rounded-lg border bg-gradient-to-b from-gray-100 to-white to-10% p-4 py-2 sm:p-5'
@@ -80,7 +81,7 @@ const parentRoadmapId = projectData?.roadmapIds?.[0] || '';
         <div
           class='prose max-w-full prose-h2:mb-3 prose-h2:mt-5 prose-h3:mb-1 prose-h3:mt-5 prose-p:mb-2 prose-blockquote:font-normal prose-blockquote:text-gray-500 prose-pre:my-3 prose-ul:my-3.5 prose-hr:my-5 [&>ul>li]:my-1'
         >
-          <project.Content />
+          <Content />
         </div>
 
         <div

src/pages/projects/[projectId]/solutions.astro

@@ -1,10 +1,6 @@
 ---
 import BaseLayout from '../../../layouts/BaseLayout.astro';
-import {
+import { getAllProjects, getProjectById } from '../../../lib/project';
-  getAllProjects,
-  getProjectById,
-  type ProjectFrontmatter,
-} from '../../../lib/project';
 import { ProjectTabs } from '../../../components/Projects/ProjectTabs';
 import { ListProjectSolutions } from '../../../components/Projects/ListProjectSolutions';
 import { ProjectSolutionModal } from '../../../components/Projects/ProjectSolutionModal';
@@ -13,7 +9,7 @@ export async function getStaticPaths() {
   const projects = await getAllProjects();
 
   return projects
-    .map((project) => project.id)
+    .map((project) => project.slug)
     .map((projectId) => ({
       params: { projectId },
     }));
@@ -26,7 +22,7 @@ interface Params extends Record<string, string | undefined> {
 const { projectId } = Astro.params as Params;
 
 const project = await getProjectById(projectId);
-const projectData = project.frontmatter as ProjectFrontmatter;
+const projectData = project.data;
 
 let jsonLdSchema: any[] = [];
 

src/pages/projects/index.astro

@@ -12,7 +12,7 @@ const allRoadmapIds = Object.keys(roadmapProjects);
 const allRoadmaps = await getRoadmapsByIds(allRoadmapIds);
 const enrichedRoadmaps = allRoadmaps.map((roadmap) => {
   const projects = (roadmapProjects[roadmap.id] || []).sort((a, b) => {
-    return a.frontmatter.sort - b.frontmatter.sort;
+    return a.data.sort - b.data.sort;
   });
 
   return {
@@ -25,7 +25,7 @@ const enrichedRoadmaps = allRoadmaps.map((roadmap) => {
 const projectIds = allRoadmapIds
   .map((id) => roadmapProjects[id])
   .flat()
-  .map((project) => project.id);
+  .map((project) => project.slug);
 const projectApiClient = projectApi(Astro);
 const { response: userCounts } =
   await projectApiClient.listProjectsUserCount(projectIds);

src/pages/questions/[questionGroupId].astro

@@ -34,7 +34,7 @@ const { data: frontmatter } = questionGroup;
   briefTitle={frontmatter.briefTitle}
   description={frontmatter.seo.description}
   keywords={frontmatter.seo.keywords}
-  permalink={`/questions/${questionGroup.id}`}
+  permalink={`/questions/${questionGroup.slug}`}
 >
   {
     !frontmatter.authorId && (