Actualmente estoy siguiendo un tutorial que cubre Lodash y me pide que devuelva este valor:
{ author: "Robert C. Martin", blogs: 3 }dada esta matriz de objetos:
const blogs = [ { _id: "5a422a851b54a676234d17f7", title: "React patterns", author: "Michael Chan", url: "https://reactpatterns.com/", likes: 7, __v: 0 }, { _id: "5a422aa71b54a676234d17f8", title: "Go To Statement Considered Harmful", author: "Edsger W. Dijkstra", url: "http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Considered_Harmful.html", likes: 5, __v: 0 }, { _id: "5a422b3a1b54a676234d17f9", title: "Canonical string reduction", author: "Edsger W. Dijkstra", url: "http://www.cs.utexas.edu/~EWD/transcriptions/EWD08xx/EWD808.html", likes: 12, __v: 0 }, { _id: "5a422b891b54a676234d17fa", title: "First class tests", author: "Robert C. Martin", url: "http://blog.cleancoder.com/uncle-bob/2017/05/05/TestDefinitions.htmll", likes: 10, __v: 0 }, { _id: "5a422ba71b54a676234d17fb", title: "TDD harms architecture", author: "Robert C. Martin", url: "http://blog.cleancoder.com/uncle-bob/2017/03/03/TDD-Harms-Architecture.html", likes: 0, __v: 0 }, { _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 } ]He intentado una gran cantidad de formas de resolver esto, pero parece que no puedo recrear la respuesta que quieren usando solo Lodash. Aquí está el código que probé pero, en vano, pude reproducir su respuesta:
const mostBlogs = async (blogs) => { let result = _.countBy(blogs.map(blog => ({author: blog.author.value}))) const b = _.maxBy(result, 'blogs'); console.log(result);Creo que estás bastante cerca. Algo así podría funcionar. Cambió el map y countBy . Primero hizo el conteo y luego mapeó sobre el objeto de resultado
const blogs = [{_id: "5a422a851b54a676234d17f7",title: "React patterns",author: "Michael Chan",url: "https://reactpatterns.com/",likes: 7,__v: 0}, { _id: "5a422aa71b54a676234d17f8", title: "Go To Statement Considered Harmful", author: "Edsger W. Dijkstra",url: "http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Considered_Harmful.html",likes: 5,__v: 0}, {_id: "5a422b3a1b54a676234d17f9", title: "Canonical string reduction", author: "Edsger W. Dijkstra", url: "http://www.cs.utexas.edu/~EWD/transcriptions/EWD08xx/EWD808.html", likes: 12, __v: 0}, { _id: "5a422b891b54a676234d17fa", title: "First class tests", author: "Robert C. Martin", url: "http://blog.cleancoder.com/uncle-bob/2017/05/05/TestDefinitions.htmll", likes: 10, __v: 0}, { _id: "5a422ba71b54a676234d17fb", title: "TDD harms architecture", author: "Robert C. Martin", url: "http://blog.cleancoder.com/uncle-bob/2017/03/03/TDD-Harms-Architecture.html", likes: 0, __v: 0}, { _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}] let result =_.map(_.countBy(blogs,'author'),(val,key)=>({author:key,blogs:val})) const maxRes = _.maxBy(result, 'blogs'); console.log(maxRes); <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>¿Algo como esto resuelve tu problema?
const author = "Robert C. Martin" console.log({ author: author, blogs: _.filter(blogs, (blog) => blog.author === author).length })Aquí hay un enlace a un ejemplo de trabajo .