ES6 - Filter an Object based on True values

Question

I have an Object which contains some booleans like this:

{ date: "2017-10-05", name_change: false, age_change: true, ... }

I want to filter() the keys which are true. I also need the date value. how can I make this filter?

Regards.

Then you need to explain your problem better, because it sure looks like a duplicate currrently — The Archetypal Paul, Oct 05 '17 at 16:12
@TheArchetypalPaul - he's filtering the properties of an object, not objects in an array. — Ori Drori, Oct 05 '17 at 17:28
@OriDrori, OK so that's a possible interpretation, but given he's also saying he wants to use `filter()`, not the only one. In either case, an edit to clarify the question would have been preferable to just declaring it wasn't a duplicate. — The Archetypal Paul, Oct 05 '17 at 17:31
And that's still a duplicate of a different question: https://stackoverflow.com/questions/44439907/filtering-out-specific-keys-in-an-object and also answered in this one https://stackoverflow.com/questions/35370646/filtering-object-by-keys-in-lodash (and probably others) — The Archetypal Paul, Oct 05 '17 at 17:33

Ori Drori · Accepted Answer · 2023-03-16T14:44:34.120

Use Object.entries() to convert the object to an array of [key, value] tuples. Filter the tuples by check if the value is true. Convert back to an object using Object.fromEntries():

const obj = { 
  date: "2017-10-05", 
  name_change: false, 
  age_change: true 
};

const result = Object.fromEntries(
  Object
    .entries(obj)
    .filter(([, val]) => val !== true)
);

console.log(result);

Old answer:

Get the keys with Object#keys, and then iterate the array of keys with Array#reduce, and build a new object that doesn't contain keys which value equals to true:

const obj = { 
  date: "2017-10-05", 
  name_change: false, 
  age_change: true 
};

const result = Object.keys(obj)
  .reduce((o, key) => {
    obj[key] !== true && (o[key] = obj[key]);

    return o;
  }, {});

console.log(result);

ES6 - Filter an Object based on True values

1 Answers1