CODEWITHSUNDEEP
javascriptarraysjsonobjectfiltering
A-D
A-D

Reputation: 371

How would you Filter an array of objects based on a condition

I have an array of objects that looks like this 

[
  { id: 1, state: 'PURCHASED' },
  { id: 2, state: 'PURCHASED' },
  { id: 3, state: 'SOLD' },
  { id: 1, state: 'SOLD' },
  { id: 4, state: 'PURCHASED' },
  { id: 6, state: 'SOLD' },
  { id: 9, state: 'PURCHASED' }
]

I would like to filter this array such that I get the items which were PURCHASED but never SOLD. The out would look something like this 

[
  { id: 2, state: 'PURCHASED' },
  { id: 3, state: 'SOLD' },
  { id: 4, state: 'PURCHASED' },
  { id: 6, state: 'SOLD' },
  { id: 9, state: 'PURCHASED' }
]

Upvotes: 1

Views: 51

Answers (1)

Nina Scholz
Nina Scholz

Reputation: 386540

You could find the index by looking for same id and if exist, delete this item.

var data = [{ id: 1, state: 'PURCHASED' }, { id: 2, state: 'PURCHASED' }, { id: 3, state: 'SOLD' }, { id: 1, state: 'SOLD' }, { id: 4, state: 'PURCHASED' }, { id: 6, state: 'SOLD' }, { id: 9, state: 'PURCHASED' }],
    result = data.reduce((r, o) => {
        var index = r.findIndex(q => o.id === q.id);
        if (index === -1) r.push(o);
        else r.splice(index, 1);
        return r;
    }, []);

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 1

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