docs: add README

README.md

@@ -12,6 +12,12 @@ Answers to [openfullstack.com](https://fullstackopen.com) course exercises from
 - [Exercises 4.3.-4.7.](https://fullstackopen.com/en/part4/structure_of_backend_application_introduction_to_testing#exercises-4-3-4-7)
   _Details solutions: [4.3](https://github.com/patchamama/fullstackopen-part4-bloglist/commit/0f1a759e78310de711531ed481917496e2f50ec8) | [4.4](https://github.com/patchamama/fullstackopen-part4-bloglist/commit/2585dc72841e8382123fa481aa149d19dd611482) | [4.5](https://github.com/patchamama/fullstackopen-part4-bloglist/commit/4fd94b8779e33ea32b3703a6e6a823291d247e0c) | [4.6](https://github.com/patchamama/fullstackopen-part4-bloglist/commit/c9d554cf41d5cbe5992fd2e2005564fab816d8ad) | [4.7](https://github.com/patchamama/fullstackopen-part4-bloglist/commit/27b41a689bf77cb20a9853fb4f7eaaa998262022)_
 
+### Test can be execute:
+
+```
+npm test
+```
+
 ### b. Testing the backend
 
 ### c. User administration

tests/blog.test.js

@@ -92,7 +92,7 @@ describe('favorites', () => {
     expect(result).toEqual({})
   })
 
-  test('Most favorite with one value', () => {
+  test('--- with one value', () => {
     const blogs = [
       {
         _id: '23234323242dssfsf',
@@ -107,21 +107,22 @@ describe('favorites', () => {
     expect(result).toEqual(blogs[0])
   })
 
-  test('Most favorite with a big list', () => {
+  test('--- with a big list', () => {
     const result = listHelper.favoriteBlog(bigbloglist)
     expect(result).toEqual(bigbloglist[0])
     expect(result.likes).toEqual(12)
   })
 })
 
 describe('Authors with more blogs', () => {
-  test('More blogs with empty list', () => {
+  test('lodash - with empty list', () => {
     const blogs = [{}]
     const result = listHelper.mostBlogs(blogs)
     console.log(result)
     expect(result).toEqual({ author: undefined, entries: 1 })
   })
-  test('More blogs with one element in the list', () => {
+
+  test('lodash - with one element in the list', () => {
     const blogs = [
       {
         _id: '5a422bc61b54a676234d17fc',
@@ -136,22 +137,53 @@ describe('Authors with more blogs', () => {
     console.log(result)
     expect(result).toEqual({ author: 'Robert C. Martin', entries: 1 })
   })
-  test('More blogs with big list', () => {
+
+  test('lodash - with big list', () => {
     const result = listHelper.mostBlogs(bigbloglist)
     console.log(result)
     expect(result).toEqual({ author: 'Robert C. Martin', entries: 3 })
   })
+
+  // Vanilla JS
+  test('Vanilla JS - with empty list', () => {
+    const blogs = [{}]
+    const result = listHelper.mostBlogsVanilla(blogs)
+    console.log(result)
+    expect(result).toEqual({ author: undefined, entries: 1 })
+  })
+
+  test('Vanilla JS - with one element in the list', () => {
+    const blogs = [
+      {
+        _id: '5a422bc61b54a676234d17fc',
+        title: 'Type wars',
+        author: 'Robert C. Martin',
+        url: 'http://blog.cleancoder.com/uncle-bob/2016/05/01/TypeWars.html',
+        likes: 2,
+        __v: 0,
+      },
+    ]
+    const result = listHelper.mostBlogsVanilla(blogs)
+    console.log(result)
+    expect(result).toEqual({ author: 'Robert C. Martin', entries: 1 })
+  })
+
+  test('Vanilla JS - with big list', () => {
+    const result = listHelper.mostBlogsVanilla(bigbloglist)
+    console.log(result)
+    expect(result).toEqual({ author: 'Robert C. Martin', entries: 3 })
+  })
 })
 
 describe('Authors with more likes', () => {
-  test('--- with empty list', () => {
+  test('lodash - with empty list', () => {
     const blogs = [{}]
     const result = listHelper.mostLikes(blogs)
     console.log(result)
     expect(result).toEqual({ author: undefined, likes: undefined })
   })
 
-  test('--- with one blog list', () => {
+  test('lodash - with one blog list', () => {
     const blogs = [
       {
         _id: '5a422bc61b54a676234d17fc',
@@ -166,9 +198,40 @@ describe('Authors with more likes', () => {
     console.log(result)
     expect(result).toEqual({ author: 'Robert C. Martin', likes: 2 })
   })
-  test('--- with big blog list', () => {
+
+  test('lodash - with big blog list', () => {
     const result = listHelper.mostLikes(bigbloglist)
     console.log(result)
     expect(result).toEqual({ author: 'Edsger W. Dijkstra', likes: 17 })
   })
+
+  // VanillaJS
+  test('VanillaJS - with empty list', () => {
+    const blogs = [{}]
+    const result = listHelper.mostLikesVanilla(blogs)
+    console.log(result)
+    expect(result).toEqual({ author: undefined, likes: undefined })
+  })
+
+  test('VanillaJS - with one blog list', () => {
+    const blogs = [
+      {
+        _id: '5a422bc61b54a676234d17fc',
+        title: 'Type wars',
+        author: 'Robert C. Martin',
+        url: 'http://blog.cleancoder.com/uncle-bob/2016/05/01/TypeWars.html',
+        likes: 2,
+        __v: 0,
+      },
+    ]
+    const result = listHelper.mostLikesVanilla(blogs)
+    console.log(result)
+    expect(result).toEqual({ author: 'Robert C. Martin', likes: 2 })
+  })
+
+  test('VanillaJS -with big blog list', () => {
+    const result = listHelper.mostLikesVanilla(bigbloglist)
+    console.log(result)
+    expect(result).toEqual({ author: 'Edsger W. Dijkstra', likes: 17 })
+  })
 })

utils/list_helper.js

@@ -34,6 +34,38 @@ const mostBlogs = (blogs) => {
   }
 }
 
+const mostBlogsVanilla = (blogs) => {
+  if (blogs.length === 0) return { author: undefined, entries: 0 }
+  else if (blogs.length === 1) return { author: blogs[0].author, entries: 1 }
+  else {
+    const groupByAuthor = blogs.reduce((result, item) => {
+      if (result[item.author]) {
+        result[item.author] += 1
+      } else {
+        result[item.author] = 1
+      }
+      return result
+    }, {})
+
+    console.log(groupByAuthor)
+
+    let authorMoreBlogs = ''
+
+    for (const author in groupByAuthor) {
+      authorMoreBlogs = authorMoreBlogs === '' ? author : authorMoreBlogs
+      if (groupByAuthor[author] > groupByAuthor[authorMoreBlogs]) {
+        authorMoreBlogs = author
+      }
+    }
+
+    console.log(authorMoreBlogs, '-', groupByAuthor[authorMoreBlogs])
+    return {
+      author: authorMoreBlogs,
+      entries: groupByAuthor[authorMoreBlogs],
+    }
+  }
+}
+
 const mostLikes = (blogs) => {
   if (blogs.length === 0) return { author: undefined, likes: undefined }
   else if (blogs.length === 1)
@@ -56,10 +88,44 @@ const mostLikes = (blogs) => {
   }
 }
 
+const mostLikesVanilla = (blogs) => {
+  if (blogs.length === 0) return { author: undefined, likes: undefined }
+  else if (blogs.length === 1)
+    return { author: blogs[0].author, likes: blogs[0].likes }
+  else {
+    const groupByAuthor = blogs.reduce((result, item) => {
+      if (result[item.author]) {
+        result[item.author] += item.likes
+      } else {
+        result[item.author] = item.likes
+      }
+      return result
+    }, {})
+
+    console.log(groupByAuthor)
+
+    let authorMoreLikes = ''
+
+    for (const author in groupByAuthor) {
+      authorMoreLikes = authorMoreLikes === '' ? author : authorMoreLikes
+      if (groupByAuthor[author] > groupByAuthor[authorMoreLikes]) {
+        authorMoreLikes = author
+      }
+    }
+
+    return {
+      author: authorMoreLikes,
+      likes: groupByAuthor[authorMoreLikes],
+    }
+  }
+}
+
 module.exports = {
   dummy,
   totalLikes,
   favoriteBlog,
   mostBlogs,
   mostLikes,
+  mostBlogsVanilla,
+  mostLikesVanilla,
 }