Select From Array By Id

Question

I have 2 arrays

One is an array that contains every project:

let allProjects = [{project_id: 1, name: "project 1"}, {project_id: 2, name: "project 2"}, {project_id: 3, name: "project 3"}, {project_id: 4, name: "project 4"}]

And one contains only project ids

let selectedProjects = [{project_id: 1}, {project_id: 2}]

How can I get the names from allProjects array and return a new array containing name and id according to the Id's that are provided in the selectedProjects array?

[`Array.prototype.filter()` +] `Array.prototype.map()` + `Array.prototype.find()` — Andreas, Nov 13 '20 at 09:37
Two `for` loops would also work, so... What have you tried so far to solve this on your own? — Andreas, Nov 13 '20 at 09:38

Thomas Sablik · Accepted Answer · 2020-11-13T09:51:49.523

0

You can use a combination of filter, map and includes:

console.log(allProjects
            .filter(project => selectedProjects
                               .map(p => p.project_id)
                               .includes(project.project_id)));

Output:

[
  { project_id: 1, name: 'project 1' },
  { project_id: 2, name: 'project 2' }
]

Probably there is a way to avoid map but for me map focuses the intention.

edited Nov 13 '20 at 09:51

answered Nov 13 '20 at 09:46

Thomas Sablik

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Select From Array By Id

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