Adding an element to an array

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I m reading data from a source as array. a[n]

I need to add one more element to the array.

Once i get the array, i create a new array with capacity n+1 and copy all the elements to the new array and put the new element as the last element of the array.

I can do this.

Is there a better way to do this? especially with Linq?

What you have described is really the only way to do it. Arrays cannot be resized in .NET, so we have to allocate a new array and copy the old into it. For example, this is how Array.Resize works. LINQ is not really a help here, and if it was, it would just be projecting the existing array into a new one anyway - which is exactly what we've just described.

If you find you need to resize the array often, you should consider using an ArrayList or, if possible, a strongly-typed List<T>.

Edit: If you are simply getting an Array from some method you cannot control, but within your code you could use an IEnumerable<T> instead, you can use LINQ to lazy-enumerate and spare the extra array allocation:

var mySequence = originalArray.Concat(new[]{myobj});


foreach(var item in mySequence)
    //do stuff

It's only when calling ToArray() that we incur the extra overhead. Otherwise we're simply doing a single enumeration over the original array and then sneaking the extra item(s) in at the end.

How to Add Elements to an Array in JavaScript, Add a new item to an array: var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.push("Kiwi");. Try it Yourself ». More "Try it Yourself" examples below. You can add elements to the end of an array using push, to the beginning using unshift, or to the middle using splice. You can also add a new element to an array simply by specifying a new index and assigning a value, as the following demonstrates:

If you want to put to arrays together using LINQ, you can use Concat:

var combined = array1.Concat(new[] { element }).ToArray();

However, you are now creating a number of different arrays for your collection. A better choice would be to just use a List. It will be backed by a single array and expanded automatically for you.

JavaScript Array push() Method, The length of an array is immutable in java. This means you can't change the size of an array once you have created it. If you initialised it with 2 elements,  As elements are added to the List, its capacity grows automatically. But if you insist on using arrays, you have to instantiate a new array to accommodate the additional element. This can be done with any of the following methods: 1. Array.CopyTo Method. We can also use Array.CopyTo() method to allocate the larger array for accommodating the new element. The following code example shows how to resize the array to add new element.

C# yield (no extra storage needed)

Using C# yield allows you to return your array and more without ever allocating extra storage. After yielding each element of the original array you can slip in any extra elements easily like so:

IEnumerable<int> GetEverything() {

    // first return the entire original array
    foreach(int num in arrNumbers)
        yield return num;

    // then slip in extra element at the end
    yield return 5;   // yield even more elements if you want...

and then you can use it like so:

foreach (int n in GetEverything())

There's no real need to pull out LINQ in this situation because the yield statement is simple and EXACTLY suited to your need.

add an element to int [] array in java, Furthermore, we'll see how to append and insert elements in an array and ArrayList. 2. Java Arrays and ArrayList. There is no shortcut method to add elements to an array in java. But as a programmer, we can write one. Here I am providing a utility method that we can use to add elements to an array. We can also use it for java copy arrays.

You could just use the array to initialize a list.

var stuff = new List<object>( a );
stuff.Add( moreStuff );

Adding an Element to a Java Array vs an ArrayList, Java array add elements, java add to array, how to add elements to array in java, java add array, java system arraycopy to add element to array in java. In order to "add" an item to a array, you have to specify in which position you'd like the item to be. By default, arrays' indexing is 0-based. For example, to insert an element in the first position: bullets[0] = myItem;

You can use Array.Resize for this:

It basically does what you've done manually but is a bit neater.

If you are adding more than one element to the array on a regular basis I'd recommend moving to a list though as it's going to be more efficient for insertions.

Java Array add elements, repeated for each passed value. Note: If you use array_push() to add one element to the array, it's better to use $array[] = because in  For an existing vector x, you can assign a new element to the end using direct indexing. Another way to add an element to a row vector “x” is by using concatenation: For a column vector: For more information, see Creating, Concatenating, and Expanding Matrices.

array_push - Manual, The push() method will add an element to the end of an array, while its twin  If you need to add elements to the beginning of an array, the unshift() method will almost always be your simplest and quickest option. Add Element(s) to the Middle of an Array Using splice() The splice() method modifies the content of an array by removing existing elements and/or adding new elements.

JavaScript "Add to Array" Functions (push vs unshift vs others , Add the required element to the array list. Convert the Array list to array. Example. import java.util.ArrayList  Store it in some variable say num and pos. To insert new element in array, shift elements from the given insert position to one position right. Hence, run a loop in descending order from size to pos to insert. The loop structure should look like for(i=size; i>=pos; i--).

How to add items to an array in java dynamically?, The push() method adds one or more elements to the end of an array and returns the elementN: The element(s) to add to the end of the array. push() is used to append elements to the end of an array. pop(), the other opposite method, removes elements from the end. We can use push() to add single or multiple elements to an array.

  • Please don't put tags like "C#" into the title. Just leave the tags in the tags, which is where tags belong.
  • unfortunately, the data source returns array, i cant help it.
  • @user what is stopping your from changing the datasource to a List once you receive it? Why keep it as an inflexible array?
  • because i have to store it back as an array. so changing that to a list and then back to an array is an overkill isnt it?
  • @RexM so Add() method works the same way (create new array) ?
  • @entropy what Add method are you referring to?
  • You should use a strongly-typed list.
  • Replace object with SomeType
  • The OP says nothing about what type he is working with, and I would assume he knows how to use a generic list. It's really beside the point.
  • If the OP is asking a question as elementary as is there some way to make an array resize, you shouldn't make any assumptions as to his knowledge of Generic collections, or his knowledge of the performance issues of casting/boxing/unboxing objects in generic collections. FFS, declaring List<object> defeats the whole point in the generic collection! You might as well use an Arraylist at this point.
  • If the OP does not understand the purpose of generics my advice would be to stop this project entirely and start reading beginner's tutorials.
  • This is slightly worse than simply copying the old array directly into the new one.
  • I agree it's not the most efficient way to probably handle this. I like your use of the Concat method. I overlooked that one. I have up voted your answer.
  • Have you actually tested that extension method? Because if it works, it means the this argument gets passed by reference, which would surprise me.