Filter data in Object in JavaScript

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I have the following object.

var Data = [{ datetime: "03:48 PM 10/31/2018", dermatologist: "Canfield", id: 4021, owner_name: "John Doe", pet_name: "Dog", score: 37 }, { datetime: "03:48 PM 10/31/2018", dermatologist: "Nicky barown", id: 4022, owner_name: "Carlos", pet_name: "Cat", score: "57" }, { datetime: "03:48 PM 10/31/2018", dermatologist: "Canfield", id: 4023, owner_name: "James", pet_name: "Parrot", score: 50 }]

JavaScript: filter() for Objects, In this example, we called the filter() method of the cities array object and passed let data = [10, 20, "30", 1, 5, 'JavaScript filter', undefined, 'example']; let range  var newArray = array.filter(function(item) { return condition; }); The item argument is a reference to the current element in the array as filter() checks it against the condition. This is useful for accessing properties, in the case of objects. If the current item passes the condition, it gets sent to the new array. Filtering an array of objects

Use Array.map() with object destructuring to get the dermatologist array:

var Data = [{
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Canfield",
      id: "4021",
      owner_name: "John Doe",
      pet_name: "Dog",
      score: "37"
    },
    {
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Nicky barown",
      id: "4022",
      owner_name: "Carlos",
      pet_name: "Cat",
      score: "57"
    },
    {
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Canfield",
      id: "4023",
      owner_name: "James",
      pet_name: "Parrot",
      score: "50"
    }
  ];
var dermatologists = Data.map(({dermatologist}) => dermatologist);
console.log(dermatologists);

Array.prototype.filter(), JavaScript Filtering Object Arrays. Example#. The filter() method accepts a test function, and returns a new  Definition and Usage. The filter() method creates an array filled with all array elements that pass a test (provided as a function). Note: filter() does not execute the function for array elements without values.

Your JSON object needs to be edited so that it can be parsed correctly. I have assumed that your Data variable is an array of JSON objects, each of which has a property dermatologist. You can access any of the array elements like so: Data[i].dermatologist

var Data =   [{
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Canfield",
      id: "4021",
      owner_name: "John Doe",
      pet_name: "Dog",
      score: "37"
    },
    {
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Nicky barown",
      id: "4022",
      owner_name: "Carlos",
      pet_name: "Cat",
      score: "57"
    },
    {
      datetime: "03:48 PM 10/31/2018",
      dermatologist: "Canfield",
      id: "4023",
      owner_name: "James",
      pet_name: "Parrot",
      score: "50"
    }
  ];
  
  console.log(Data[0].dermatologist);   //Canfield
  console.log(Data[1].dermatologist);   //Nicky barown
  //alternatively:
  console.log(Data[2]["dermatologist"]);   //Canfield
  
  

JavaScript Array Filter: Filtering Array Elements Based on a Test , How often do you find yourself managing a massive object received from a third-​party API or reading data from a JSON file? In JavaScript  let cities = data.filter(val => val.population > 500000000); Just like above, this code will test each value in our array to determine if the population is greater than 500 million. If it is, a true value is returned which will add the element to the cities array!

JavaScript, var matchingKeys = myKeys.filter(function(key){ return key. As an example of how your data-structure could've been made different such I would also question the purpose of these types in JavaScript, but I assumed they  Summary: in this tutorial, you will learn how to use the JavaScript Array filter() method to filter elements in an array.. Introduction to JavaScript array filter() method. One of the most common tasks when working with an array is to create a new array that contains a subset of elements of the original array.

JavaScript Tips #1: The Filter Method for Object Properties., Hi! I'm trying to find the best way to filter a json file. Here's the json: var data = { laureates: [ { id: "1", firstname: "Wilhelm Conrad", surname:  The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Quickly filter an object by keys, Note: filter() does not execute the function for array elements without values. Note​: filter() does arr, Optional. The array object the current element belongs to  The this Keyword. In a function definition, this refers to the "owner" of the function. In the example above, this is the person object that "owns" the fullName function. In other words, this.firstName means the firstName property of this object.

Comments
  • Date !== Data
  • You want all the dermatologists names?
  • That object isn't remotely valid JavaScript.
  • Thanks, @NinaScholz I Edited the question.
  • @Muddasir23 — After your latest edit, the JS data structure still won't compile. You need to provide a real minimal reproducible example.
  • Thanks, it's easy for me to implement and works like a charm.
  • The data structure in the question is invalid, so you've had to guess at what the real data structure is. What you have can't be what the OP has because they said that var result = Date['dermatologist'] returns one record.
  • I think OP just guessed that because you see that the variable name is Date and OP has given the structure with variable name data
  • @Quentin I think anyone can determine OP meant to write Data just by looking at the code.
  • @Roj — It seems fairly obvious up until you get to the bit in the question where var result = Data['dermatologist'] successfully gets one record.
  • @Quentin true. But there's nothing wrong with asking for clarification or pushing someone in the right direction by giving better alternatives rather than shutting them down.