Delete duplicates in an array

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Delete duplicates in an array
  1. One of the function use the native method of JS ES6
  2. Is there a better method (compatibility and performance) ?

Note: filter the undefined element in the array

English is weak and maybe described as inaccurate. >﹏<

Thanks

function delRepeatArray1(arr) {
    console.time();
    var result = Array.from(new Set(arr));
    console.timeEnd();

    return result;
}

function delRepeatArray2(arr) {
    console.time();
    var result = arr.filter(function (em, index, arr) {
        return arr.indexOf(em) === index;
    });
    console.timeEnd();

    return result;
}

var arr = ["undefined", "200", 0, -0, 200, undefined, undefined, null, true, null, "true", false, 0, true, 200, false],
    result1 = delRepeatArray1(arr),
    result2 = delRepeatArray2(arr);

console.log(result1);
console.log(result2);

Here is quick snippet to get you unique value from the provided array:

var arr = ["undefined", "200", 0, -0, 200, undefined, undefined, null, true, null, "true", false, 0, true, 200, false];
var uniqueNames = [];
$.each(arr, function(i, el){
    if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
});
console.log(uniqueNames);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Remove duplicates from unsorted array using Map data structure , Copy j elements from temp[] to arr[] and return j. Produces a duplicate-free version of the array, using === to test object equality. If you know in advance that the array is sorted, passing true for isSorted will run a much faster algorithm. If you want to compute unique items based on a transformation, pass an iterator function. Example

Cant we simply make it a set?

var arr = ["undefined", "200", 0, -0, 200, undefined, undefined, null, true, null, "true", false, 0, true, 200, false];
var filteredarr = arr.filter(Boolean); //filter undefined
var set = new Set(filteredarr); //remove duplicates
console.log(set);

JavaScript: Remove Duplicates from an Array, Given an unsorted array of integers, Print the array after removing the duplicate elements from it. We need to print distinct array elements according to their first� Create a Function. If you like to have a function where you can send your lists, and get them back without duplicates, you can create a function and insert the code from the example above.

I found a benchmark that compares a few methods for this. The fastest method was on my system is a plain and simple loop.

function unique(arr) {
  let out = [];
  const len = arr.length;
  for (let i = 0; i != len; ++i) {
    const obj = arr[i];
    if (out.indexOf(obj) == -1) out.push(obj);
  }
  return out;
}

Although, the benchmark shows that using reduce is faster on other systems.

function unique(arr) {
  return arr.reduce((out, obj) => {
    if (out.indexOf(obj) == -1) out.push(obj);
    return out;
  }, []);
}

How to Remove Array Duplicates in ES6, To remove duplicates from an array: First, convert an array of duplicates to a Set . The new Set will implicitly remove duplicate elements. Then, convert the set back to an array. C Program to Delete Duplicate Elements from an Array Example 1. This program to remove duplicates from array in c allows the user to enter Array Size and array elements. Next, it is going to find the duplicate elements present in this array, and delete them using For Loop.

The fastest method is using Set to filter out the duplicates. On your small array there is no difference whatsoever, to benchmark your code you should try a larger array (e.g. at least 65k elements). Then you will see that regular loop (yours delRepeatArray2) it's much slower compare to Set that will basically keep the same time you have with a smaller group of items.

Said that, we're still talking about few milliseconds.

If you want to filter out the undefined, it's better you do it after you have reduce to the unique values, so you have only one undefined in the Set, and can be easily removed:

var set = new Set(arr);
set.delete(undefined);
return Array.from(set);

Remove Duplicates from Sorted Array, Here are three ways to filter out duplicates from an array and return only the unique values. My favorite is using Set cause it's the shortest and� There are several ways using which you can remove duplicates from the String array in Java as given below. 1) Java String array remove duplicates using Set (HashSet/LinkedHashSet) One of the properties of the Set is that it does not allow duplicate elements. We can use this property to remove duplicates from an array as given below.

7 ways to remove duplicates from an array in JavaScript, Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length. Do not allocate extra space for� Duplicates in an array in O(n) and by using O(1) extra space | Set-2; Find Duplicates of array using bit array; Duplicates in an array in O(n) time and by using O(1) extra space | Set-3; Find the frequencies of all duplicates elements in the array; Check if array contains contiguous integers with duplicates allowed; Find a Fixed Point in an

How to efficiently remove duplicates from an array without using Set , It's a common use case in many projects to need to remove duplicates from an array in Duration: 14:19 Posted: Feb 18, 2020 There are multiple ways to remove duplicates from an array. The simplest approach (in my opinion) is to use the Set object which lets you store unique values of any type. In other words, Set will automatically remove duplicates for us.

Java Program to Remove Duplicate Element in an Array, you can take the help of Set collection int end = arr.length; Set<Integer> set = new HashSet<Integer>(); for(int i = 0; i < end; i++){ set.add(arr[i]); }. now if you will � Summary: in this tutorial, you will learn how to remove duplicates from an array in JavaScript. 1) Remove duplicates from an array using a Set. A Set is a collection of unique values. To remove duplicates from an array: First, convert an array of duplicates to a Set. The new Set will implicitly remove duplicate elements.

Comments
  • Possible duplicate of Get all unique values in a JavaScript array (remove duplicates)
  • Post your expected output please