An array in C# is a collection of variables that are stored together in a contiguous block of memory. Arrays are used to store multiple values in a single object, and can be used to store values of any data type, including primitive types like integers and strings, and reference types like objects.
Arrays are defined using the [] operator, followed by the type of data that the array will hold. For example, here is how you might declare and initialize an array of integers in C#:
int[] numbers = { 1, 2, 3, 4, 5 };
You can also specify the size of the array when you create it, like this:
int[] numbers = new int[5];
This creates an array with 5 elements, all of which are initialized to their default value (0 for integers).
But, which are the top 5 used methods in arrays in C#?
Array.Sort
This method sorts the elements in an array in ascending order. Example:
int[] numbers = { 3, 1, 4, 2 };
Array.Sort(numbers);
// numbers is now [1, 2, 3, 4]
Array.Reverse
This method reverses the order of the elements in an array. Example:
int[] numbers = { 1, 2, 3, 4 };
Array.Reverse(numbers);
// numbers is now [4, 3, 2, 1]
Array.IndexOf
This method searches an array for a specific value, and returns the index of the first occurrence of that value. If the value is not found, it returns -1. Example:
int[] numbers = { 1, 2, 3, 4 };
int index = Array.IndexOf(numbers, 3);
// index is now 2
Array.Clear
This method sets all the elements of an array to a default value (usually 0 or null). Example:
int[] numbers = { 1, 2, 3, 4 };
Array.Clear(numbers, 0, numbers.Length);
// numbers is now [0, 0, 0, 0]
Array.Resize
This method changes the size of an array, either by adding or removing elements. Example:
int[] numbers = { 1, 2, 3, 4 };
Array.Resize(ref numbers, 6);
// numbers is now [1, 2, 3, 4, 0, 0]
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