How to filter array of object without for loop and based on start and end limits

How to filter array of object without for loop and based on start and end limits

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I have startLimit=2 and endlimit=4 so i need to get only records from 2 to 4 in Items array with out using for loop

var favorites = {
  "userID": "12345678",
  "Items": [{
      "productID": "11234567",
      "added": "TIMESTAMP",
      "title": "Project",
      "type": "Weekend Project",
      "imageURL": "1"
    },

    {
      "productID": "11223456",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },

    {
      "productID": "11223345",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223721",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "1122456",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223734",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "11224566",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    }

  ]
};

You can use Array.prototype.slice to get range of items from an array as below:

var favorites = {
  "userID": "12345678",
  "Items": [{
      "productID": "11234567",
      "added": "TIMESTAMP",
      "title": "Project",
      "type": "Weekend Project",
      "imageURL": "1"
    },

    {
      "productID": "11223456",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },

    {
      "productID": "11223345",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223721",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "1122456",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223734",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "11224566",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    }

  ]
};

var sliced = favorites.Items.slice(1, 4); 

console.log(sliced);

Array.prototype.filter(), The filter() method creates a new array with all elements that pass the the value of the element; the index of the element; the Array object being traversed the array after the call to filter() begins will not be visited by callback . Following example uses filter() to filter array content based on search criteria. Using Filter. Array.Filter returns a new array of elements which pass the given test functions. It loops over all the elements of the source array, calling test function for each item, if test function returns true, the element will be added to the new array. With Filter function, we can just supply the core test logic of the function,


To get the 2 to 4 elements of an array, use

var favorites = {
  "userID": "12345678",
  "Items": [{
      "productID": "11234567",
      "added": "TIMESTAMP",
      "title": "Project",
      "type": "Weekend Project",
      "imageURL": "1"
    },

    {
      "productID": "11223456",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },

    {
      "productID": "11223345",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223721",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "1122456",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223734",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "11224566",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    }

  ]
};

var arr = favorites.Items;

var result = arr.slice(2, 4);

console.log(result);

Stop Array.forEach and start using filter, map, some, reduce functions., Stop Array.forEach and start using filter, map, some, reduce functions. stop using forEach or _.each and start using specific methods like filter, map, reduce, some etc… it's not It loops over all the elements of the source array, calling test function for each item, if test function Example 2:- Filter objects with tags javascript Array Filter (vs FOR Loop). In this video we create a data set and then extract only certain values first using FOR Loop and then using array.filter. This video gives an example of array.prototype


Use slice():

var favorites = {
  "userID": "12345678",
  "Items": [{
      "productID": "11234567",
      "added": "TIMESTAMP",
      "title": "Project",
      "type": "Weekend Project",
      "imageURL": "1"
    },

    {
      "productID": "11223456",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },

    {
      "productID": "11223345",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223721",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "1122456",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    },
    {
      "productID": "11223734",
      "added": "TIMESTAMP",
      "title": "Bathroom",
      "type": "Weekend Project",
      "imageURL": "2"
    },
    {
      "productID": "11224566",
      "added": "TIMESTAMP",
      "title": "Curves",
      "type": "Collections",
      "imageURL": "3"
    }

  ]
};
var startLimit = 2, endLimit = 4;
var res = favorites.Items.slice(startLimit,endLimit);
console.log(res);

Filtering and Chaining in Functional JavaScript, M. David Green uses filtering to limit a data set & chaining to JavaScript gives you the opportunity to use object oriented of the items in an array, and without the need for a loop or local state Filtering allows you to evaluate every item of an array, and based on a Don't be afraid to start filtering today. 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.


var yourNewArray = favorites.Items.slice(1,4); console.log(yourNewArray);

parameters 1 and 4 because index of slice starts from 0 , so second element would be 1 and fourth element would be 3 but in slice it excludes last hence 4.

Array methods, The splice method is also able to insert the elements without any removals. Both start and end can be negative, in that case position from array end is assumed. They are used to calculate a single value based on the array. For example, here we use a method of army object as a filter, and thisArg  http://www.webtunings.com/ https://www.facebook.com/pages/WebTunings/339234242822202 I highly recommend this book for beginners as well as advanced programme


How do I implement a fast way to filter a large array of 20k objects , The app contains an array of 20k “word” objects with the word and search function takes a few seconds depending on the search, so the I've tried just running the function without the DOM aspect and it's still slow. I've even tried rewriting my .filter() function as a for loop with various startsWith(start); }) }. Checks if any item in an array passes the condition. A good use case would be checking for user privileges. It can also be used similarly to a .forEach() where you would perform an action on each array item and break out of the loop once a truthy value is returned.


How to Manipulate Arrays in JavaScript, This method adds items to the end of an array and changes the If the second parameter is not declared, every element starting from Here's the syntax:string.​split(separator, limit); let results = array.filter(function(item, index, array) { // returns true if Arrays; Control flow; Functions; Objects; Operators. Create an HTML table from an array. Filter array: Create an array subset from an array based on the specified filter or condition. Join: Create a string from all the items in an array and separate each item with the specified character. Select: Create an array from the specified properties for all the items in a different array.


JavaScript Array Filter: Filtering Array Elements Based on a Test , Summary: in this tutorial, you will learn how to use the JavaScript Array filter() you typically loop over the array elements using a for loop and test if the value of the In this example, we called the filter() method of the cities array object and It is important to note that the filter() method does not change the original array. When working with an array, you might want to remove a certain value or values from it. The traditional way would be to use a for loop and go through each item in the array. If you want to keep an item, you would push it to a new array.