AmoDinho
commented
5 years ago let groupByCourse = data.getBooksByCourse.reduce((acc, it) => (
acc[it.course] = it,
acc
), {})
// let course = data.getBooksByCourse.reduce((h, obj) => Object.assign(h, { [obj.key]: (h[obj.key] || []).concat(obj) }), {})
//console.log(groupByCourse)
///console.log(course)
// const grouped = data.getBooksByCourse.reduce((acc, it) => acc.set(it.course, [...acc.get(it.course) || [], it]), new Map())
//MDN FUNCTION
const mdnCourse = data.getBooksByCourse.reduce((acc, obj) => {
var key = obj[course];
if (!acc[key]) {
acc[key] = [];
}
acc[key].push(obj);
return acc;
}, {})
console.log(mdnCourse)
console.log(data.getBooksByCourse)
https://stackoverflow.com/questions/14446511/most-efficient-method-to-groupby-on-an-array-of-objects
https://stackoverflow.com/questions/40774697/how-to-group-an-array-of-objects-by-key/40774906
https://gist.github.com/JamieMason/0566f8412af9fe6a1d470aa1e089a752
https://codeburst.io/grouping-array-data-json-ef96b438b927
https://learnwithparam.com/blog/how-to-group-by-array-of-objects-using-a-key/
https://codeburst.io/useful-javascript-array-and-object-methods-6c7971d93230