mapping and filtering chaining

Question

The data looks like this

[{time: '09:00', 'level':'x3', 'type':'ae'}
time: '10:00', 'level':'x6', 'type':'fe'}
time: '09:00', 'level':'y3', 'type':'hy'}
time: '11:00', 'level':'z3', 'type':'hy'}]

The result what i would like to get: filter by the time - 09:00, and create splitted arrays for the same kinds.

Example result:

{"levels": [ "x3","y3"],"types": ["ae","hy"]}

I can do this in three function(filter and map) but I would like to chain them. Is it possible in more elegant way?

Thanks in advance.

Answer 1

Note: the result will be an object containing the two arrays. To get that object, you can use reduce like this:

var arr = [
  {time: '09:00', 'level':'x3', 'type':'ae'},
  {time: '10:00', 'level':'x6', 'type':'fe'},
  {time: '09:00', 'level':'y3', 'type':'hy'},
  {time: '11:00', 'level':'z3', 'type':'hy'}
];

var result = arr.filter(o => o.time === '09:00')
                .reduce((acc, o) => {
                    acc.levels.push(o.level);
                    acc.types.push(o.type);
                    return acc;
                }, {levels: [], types: []});
   
console.log(result);