Question 192846 in Javascript Question posted in
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Javascript – How to get the latest data which is unique in angular

I have original data like this in array arr

[
{Id:1,
Date:20/06/2023,
ProdId:1
},
{Id:2,
Date:21/06/2023,
ProdId:1
},
{Id:3,
Date:21/06/2023,
ProdId:2
},
{Id:4,
Date:23/06/2023,
ProdId:2
},
{Id:5,
Date:20/06/2023,
ProdId:3
}
]

I want the items with unique prodIds and it should be latest. I should get the below data

[
{Id:2,
Date:21/06/2023,
ProdId:1
},
{Id:4,
Date:23/06/2023,
ProdId:2
},
{Id:5,
Date:20/06/2023,
ProdId:3
}
]

What I need to do? Thanks in advance!!

Tags:

2

Answers


  1. 0

    I’m sure there is probably an easier way, but this worked for me:

        this.customers.sort((a, b) =>
      new Date(b.Date) > new Date(a.Date) ? 1 : -1
    );
    var uniqueCustomers = this.customers.filter((value, index, array) =>
      array.findIndex((c) => c.ProdId === value.ProdId) === index
    );
    console.log(JSON.stringify(uniqueCustomers));

    This code first sorts by the date. Then filters for unique values based on the ProdId.

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  2. 0 
    const myArray = [
  {Id:1,
  Date:20/06/2023,
  ProdId:1
  },
  {Id:2,
  Date:21/06/2023,
  ProdId:1
  },
  {Id:3,
  Date:21/06/2023,
  ProdId:2
  },
  {Id:4,
  Date:23/06/2023,
  ProdId:2
  },
  {Id:5,
  Date:20/06/2023,
  ProdId:3
  }
];

    Trick:

    const modifiedArray = myArray.filter((item, idx, array) =>
          array.findLastIndex((c) => c.ProdId === item.ProdId) === idx
    );
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