Using filter() inside the filter() in JavaScript

Question

I have a problem to filter the data, this is my data:

var data = {
    CustomerInfo: [{ id : 3, name: "c" }],
    detail: {company: "Google"},
    location: {country: "Italy"},
    CustomerInfo2: [{ id : 4, name: "d" }]
};

and I want to print each name that is not the object format (data[x][x] !== 'object'). for example, print just the "company" and "country". here is my code:

var dataFiltered = Object.keys(data).filter(function(parent){

    return Object.keys(data[parent]).filter(function(child){
      return typeof data[parent][child] !== 'object';
    });

}).reduce(function(prev, child) {
  console.log(prev + " >>> " + data[child]);
});

I am kind of messed up with the filter inside the filter.

at the end I want this result:

company >>> Google
country >>> Italy

The filter callback is expected to return a boolean. Not an array like your inner filter — Bergi
– Bergi, Commented Sep 25, 2017 at 18:03
@Bergi no because you can also access properties of objects with foo[bar] — Kristianmitk
– Kristianmitk, Commented Sep 25, 2017 at 18:13
@Kristianmitk You can do that on strings as well, so no difference there. I'm not sure what your actual goal is, the distinction in your example would work if Array.isArray just fine. — Bergi
– Bergi, Commented Sep 25, 2017 at 18:17

marvel308 · Accepted Answer · 2017-09-25 18:05:58Z

1

You can do

var data = {
    CustomerInfo: [{ id : 3, name: "c" }],
    detail: {company: "Google"},
    location: {country: "Italy"},
    CustomerInfo2: [{ id : 4, name: "d" }]
};

let result = Object.keys(data).reduce((a, b) => {
    if(typeof data[b] == 'object'){
        for(let element of Object.keys(data[b])){
            if(typeof data[b][element] != 'object'){
                a.push(data[b][element]);
                console.log(element, '>>>', data[b][element]);
            }
        }
    }
    return a;
},[]);

console.log(result)

answered Sep 25, 2017 at 18:05

marvel308

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