Crew manifest challenge - what’s the job?

Get the full dataset of a crew manifest of various ficticious spacecraft from the following endpoint:

https://devrel.wearedevelopers.com/code100-puzzles/009-zagreb/crews.json

The structure of the file is the following (this is an excerpt):

[
    { "name": "Philip J. Fry", "ship": "Planet Express Ship", "job": "Delivery Boy", "age": 25 },
    { "name": "Luke Skywalker", "ship": "Millennium Falcon", "job": "Jedi", "age": -1 },
    { "name": "Marvin", "ship": "Heart of Gold", "job": "Paranoid Android", "age": 30 },
    { "name": "Pavel Chekov", "ship": "USS Enterprise NCC-1701", "job": "Navigator", "age": 22 },
    { "name": "Doctor John A. Zoidberg", "ship": "Planet Express Ship", "job": "Doctor", "age": 86 },
    { "name": "Kaylee Frye", "ship": "Serenity", "job": "Mechanic", "age": 23 },
    { "name": "Simon Tam", "ship": "Serenity", "job": "Doctor", "age": 28 }
]

Show a list of the jobs of all the crew members over 25 years old. No duplicates and in alphabetical order.

For the demo sample above here, this would be:

["Doctor", "Paranoid Android"]

Actual data used in the competition

Explanation

This is not a tough one. The only thing to take care of is to ensure that you don’t assume data, but test it’s value. Not every crew member in the dataset had a job, so this could be a stumbling block. Other than that:

create a new jobs array
loop through the crew array
check if the person is over 25 and has a job
add it to the array
make the array unique, sort it, and join it into a string

Code solutions

There are many ways to solve this. This JavaScript solution can help as an example:

const jobsByAge =  (crews) => {
    let jobs = [];
    crews.forEach((person) => {
        if (person.age > 25 && person.job) {
            jobs.push(person.job);
        }
    });
    console.log(
        JSON.stringify(
            [...new Set(jobs)].sort()
        )
    );
}

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