A curated collection of useful C# snippets that you can understand in 30 seconds or less.
Note: This project is inspired by 30 Seconds of Code, but there is no affiliation with that project.
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approximatelyEqualaverageaverageBybinomialCoefficientdegreesToRadsdigitizedistancefactorialfibonaccigcdgeometricProgressioninRangeisDivisibleisEvenisPrimeisOddlcmluhnCheckmaxmedianminprimesradsToDegreesrandomIntArrayInRangerandomIntegerInRangerandomNumberInRangeroundsdbmstandardDeviationsumsumBy
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byteSizecapitalizecapitalizeEveryWordcountVowelscsvToArraycsvToJsondecapitalizeendsWithRegexescapeHtmlescapeRegExpfromCamelCaseindentStringisAbsoluteUrlisAnagramisLowerCaseisUpperCasemaskpadpalindromepluralizeremoveNonAsciireverseStringsortCharactersInStringsplitLinesstartsWithRegexstringPermutationsstripHtmlTagstoCamelCasetoKebabCasetoSnakeCasetoTitleCasetruncateStringunescapeHTMLurlJoinwords
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Returns the day of the current year
Already integrated into C# https://docs.microsoft.com/de-de/dotnet/api/system.datetime.dayofyear?view=netframework-4.7.2
using System;
namespace Conplement.Snippets.Date
{
public static partial class Date
{
public static int DayOfYear()
{
return DateTime.Now.DayOfYear;
}
}
}Examples
Conplement.Snippets.Date.DayOfYear() # 12/31/2016: day 366 of 2016 (Leap Year)Returns the human readable format of the given number of milliseconds.
// TODOExamples
// TODOReturns a string of the form HH:MM:SS from a DateTime or TimeSpan object.
namespace Conplement.Snippets.Date
{
public static partial class Date
{
public static string GetColonTimeFromDate(this DateTime dateTime)
{
return $"{dateTime.Hour.ToString("D2")}:{dateTime.Minute.ToString("D2")}:{dateTime.Second.ToString("D2")}";
}
public static string GetColonTimeFromDate(this TimeSpan timeSpan)
{
return $"{timeSpan.Hours.ToString("D2")}:{timeSpan.Minutes.ToString("D2")}:{timeSpan.Seconds.ToString("D2")}";
}
}
}Examples
new DateTime(2018, 11, 22, 17, 53, 23).GetColonTimeFromDate() # 17:53:23
new DateTime(1990, 1, 2, 3, 41, 5).GetColonTimeFromDate() # 03:41:05
new TimeSpan(1, 33, 7).GetColonTimeFromDate() # 01:33:07Returns the difference (in days) between two dates.
// TODOExamples
// TODOConverts an integer to a suffixed string, adding am or pm based on its value.
// TODOExamples
// TODOCheck if a date is after another date.
// TODOExamples
// TODOCheck if a date is before another date.
// TODOExamples
// TODOCheck if a date is the same as another date.
// TODOExamples
// TODOReturns the maximum of the given dates.
// TODOExamples
// TODOReturns the minimum of the given dates.
// TODOExamples
// TODOReturns tomorrow's date.
// TODOExamples
// TODOCheck if all elements in an array are equal.
// TODOExamples
// TODOConverts a 2D array to a comma-separated values (CSV) string.
// TODOExamples
// TODOSplits values into two groups. If an element in filter is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.
// TODOExamples
// TODObubbleSort uses the technique of comparing and swapping
// TODOExamples
// TODOChunks an array into smaller arrays of a specified size.
// TODOExamples
// TODORemoves invalid values from an array.
// TODOExamples
// TODOGroups the elements of an array based on the given function and returns the count of elements in each group.
// TODOExamples
// TODOCounts the occurrences of a value in an array.
// TODOExamples
// TODODeep flattens an array of arrays.
// TODOExamples
// TODOReturns the difference between two arrays.
// TODOExamples
// TODOReturns the difference between two arrays, after applying the provided function to each array element of both.
// TODOExamples
// TODOFilters out all values from an array for which the comparator function does not return true.
// TODOExamples
// TODOReturns a new array with n elements removed from the left.
// TODOExamples
// TODOReturns a new array with n elements removed from the right.
// TODOExamples
// TODORemoves elements from the end of an array until the passed function returns true. Returns the remaining elements in the array.
// TODOExamples
// TODORemoves elements in an array until the passed function returns true. Returns the remaining elements in the array.
namespace Conplement.Snippets.Enumerable
{
public static partial class Enumerable
{
public static IEnumerable<T> DropWhile<T>(this IEnumerable<T> list, Func<T, bool> filter)
{
if (list == null)
{
throw new ArgumentNullException(nameof(list));
}
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
var reachedDropPoint = false;
foreach (var element in list)
{
if (!reachedDropPoint && !filter(element))
{
continue;
}
reachedDropPoint = true;
yield return element;
}
yield break;
}
}
}Examples
new List<int>{ 1, 2, 3, 4, 1}.DropWhile(x => x => x > 2); # new List<int> { 3, 4, 1 }Returns every nth element in an array.
// TODOExamples
// TODOFilters out the non-unique values in an array.
// TODOExamples
// TODOFilters out the non-unique values in an array, based on a provided comparator function.
// TODOExamples
// TODOReturns the last element for which the provided function returns a truthy value.
// TODOExamples
// TODOReturns the index of the last element for which the provided function returns a truthy value.
// TODOExamples
// TODOFlattens an array up to the specified depth.
// TODOExamples
// TODOExecutes a provided function once for each array element, starting from the array's last element.
// TODOExamples
// TODOGroups the elements of an array based on the given function.
// TODOExamples
// TODOChecks an array for duplicate values. Returns true if duplicate values exist and false if values are all unique.
// TODOExamples
// TODOReturns the head of a list.
// TODOExamples
// TODOReturns all indices of a value in an array.
If the value never occurs, returns [].
// TODOExamples
// TODOReturns all the elements of an array except the last one.
// TODOExamples
// TODOInitializes a 2D array of given width and height and value.
namespace Conplement.Snippets.Enumerable
{
public static partial class Enumerable
{
public static T[,] Initialize2DArray<T>(uint width, uint height, T defaultValue = default(T))
{
if (width == 0)
{
throw new ArgumentException($"Minimum {nameof(width)} has to be 1", nameof(width));
}
if (height == 0)
{
throw new ArgumentException($"Minimum {nameof(height)} has to be 1", nameof(height));
}
var newArray = new T[width, height];
for (int widthIndex = 0; widthIndex < width; widthIndex++)
{
for (int heightIndex = 0; heightIndex < height; heightIndex++)
{
newArray[widthIndex, heightIndex] = defaultValue;
}
}
return newArray;
}
}
}Examples
Enumerable.Initialize2DArray(2, 2, 0) # new int[2, 2] { { 0, 0 }, { 0, 0 } }Initializes an array containing the numbers in the specified range where start and end are inclusive with their common difference step.
// TODOExamples
// TODOInitializes an array containing the numbers in the specified range (in reverse) where start and end are inclusive with their common difference step.
// TODOExamples
// TODOInitializes and fills an array with the specified values.
// TODOExamples
// TODOCreate a n-dimensional array with given value.
// TODOExamples
// TODOReturns a list of elements that exist in both arrays.
// TODOExamples
// TODOReturns a list of elements that exist in both arrays, after applying the provided function to each array element of both.
// TODOExamples
// TODOReturns a list of elements that exist in both arrays, using a provided comparator function.
// TODOExamples
// TODOReturns 1 if the array is sorted in ascending order, -1 if it is sorted in descending order or 0 if it is not sorted.
// TODOExamples
// TODOJoins all elements of an array into a string and returns this string. Uses a separator and an end separator.
// TODOExamples
// TODO
Converts an array of objects to a comma-separated values (CSV) string that contains only the columns specified.
// TODOExamples
// TODOReturns the last element in an array.
// TODOExamples
// TODOTakes any number of iterable objects or objects with a length property and returns the longest one.
If multiple objects have the same length, the first one will be returned.
Returns -1 if no arguments are provided.
// TODOExamples
// TODOReturns the n maximum elements from the provided array.
If n is greater than or equal to the provided array's length, then return the original array (sorted in descending order).
// TODOExamples
// TODOReturns the n minimum elements from the provided array.
If n is greater than or equal to the provided array's length, then return the original array (sorted in ascending order).
// TODOExamples
// TODOReturns true if the provided predicate function returns false for all elements in a collection, false otherwise.
// TODOExamples
// TODOReturns the nth element of an array.
// TODOExamples
// TODOMoves the specified amount of elements to the end of the array.
// TODOExamples
// TODOSorts a collection of arrays.
// TODOExamples
// TODOGroups the elements into two arrays, depending on the provided function's truthiness for each element.
// TODOExamples
// TODOGenerates all permutations of an array's elements (contains duplicates).
// TODOExamples
// TODORetrieves all of the values for a given key.
// TODOExamples
// TODOMutates the original array to filter out the values specified.
// TODOExamples
// TODOMutates the original array to filter out the values at the specified indexes.
// TODOExamples
// TODOMutates the original array to filter out the values specified. Returns the removed elements.
// TODOExamples
// TODOMutates the original array to filter out the values specified, based on a given iterator function.
// TODOExamples
// TODOFilter an array of objects based on a condition while also filtering out unspecified keys.
// TODOExamples
// TODOApplies a function against an accumulator and each element in the array (from left to right), returning an array of successively reduced values.
// TODOExamples
// TODOReturns the minimum/maximum value of an array, after applying the provided function to set comparing rule.
// TODOExamples
// TODOTakes a predicate and array, like Array.prototype.filter(), but only keeps x if pred(x) === false.
// TODOExamples
// TODORemoves elements from an array for which the given function returns false.
// TODOExamples
// TODOReturns a random element from an array.
// TODOExamples
// TODOGets n random elements at unique keys from array up to the size of array.
// TODOExamples
// TODOThis method changes the contents of an array by removing existing elements and/or adding new elements.
Similar to the JavaScript version Array.prototype.splice()
// TODOExamples
// TODORandomizes the order of the values of an array, returning a new array.
// TODOExamples
// TODOReturns an array of elements that appear in both arrays.
// TODOExamples
// TODOReturns the lowest index at which value should be inserted into array in order to maintain its sort order.
// TODOExamples
// TODOReturns the lowest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.
// TODOExamples
// TODOReturns the highest index at which value should be inserted into array in order to maintain its sort order.
// TODOExamples
// TODOReturns the highest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.
// TODOExamples
// TODOPerforms stable sorting of an array, preserving the initial indexes of items when their values are the same. Does not mutate the original array, but returns a new array instead.
// TODOExamples
// TODOReturns the symmetric difference between two arrays, without filtering out duplicate values.
// TODOExamples
// TODOReturns the symmetric difference between two arrays, after applying the provided function to each array element of both.
// TODOExamples
// TODOReturns the symmetric difference between two arrays, using a provided function as a comparator.
// TODOExamples
// TODOReturns all elements in an array except for the first one.
// TODOExamples
// TODOReturns an array with n elements removed from the beginning.
// TODOExamples
// TODOReturns an array with n elements removed from the end.
// TODOExamples
// TODORemoves elements from the end of an array until the passed function returns true. Returns the removed elements.
// TODOExamples
// TODORemoves elements in an array until the passed function returns true. Returns the removed elements.
// TODOExamples
// TODOReduces a given Array-like into a value hash (keyed data store).
// TODOExamples
// TODOReturns every element that exists in any of the two arrays once.
// TODOExamples
// TODOReturns every element that exists in any of the two arrays once, after applying the provided function to each array element of both.
// TODOExamples
// TODOReturns every element that exists in any of the two arrays once, using a provided comparator function.
// TODOExamples
// TODOReturns all unique values of an array.
// TODOExamples
// TODOReturns all unique values of an array, based on a provided comparator function.
// TODOExamples
// TODOReturns all unique values of an array, based on a provided comparator function.
// TODOExamples
// TODOReturns the unique symmetric difference between two arrays, not containing duplicate values from either array.
// TODOExamples
// TODOFilters out the elements of an array, that have one of the specified values.
// TODOExamples
// TODOCreates a new array out of the two supplied by creating each possible pair from the arrays.
// TODOExamples
// TODOChecks if two numbers are approximately equal to each other.
// TODOExamples
// TODOReturns the average of two or more numbers.
The method excepts numbers as params and returns the average as a result
Linq documentation https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.sum?view=netframework-4.7.2
namespace Conplement.Snippets.Math
{
public static partial class Math
{
public static double Average(this uint[] elements)
{
if (elements.Length == 0) return 0;
return elements.Aggregate(0.0, (current, element) => current + element) / elements.Length;
}
}
}Examples
{ 4, 5, 9, 1, 0 }.Average() # 3.8Returns the average of an array, after mapping each element to a value using the provided function.
// TODOExamples
// TODOEvaluates the binomial coefficient of two integers n and k.
// TODOExamples
// TODOConverts an angle from degrees to radians.
// TODOExamples
// TODOConverts a number to an array of digits.
// TODOExamples
// TODOReturns the distance between two points.
// TODOExamples
// TODOCalculates the factorial of a number.
// TODOExamples
// TODOGenerates an array, containing the Fibonacci sequence, up until the nth term.
// TODOExamples
// TODOCalculates the greatest common divisor between two or more numbers/arrays.
// TODOExamples
// TODOInitializes an array containing the numbers in the specified range where start and end are inclusive and the ratio between two terms is step.
Returns an error if step equals 1.
// TODOExamples
// TODOChecks if the given number falls within the given range.
// TODOExamples
// TODOChecks if the first numeric argument is divisible by the second one.
// TODOExamples
// TODOReturns true if the given number is even, false otherwise.
// TODOExamples
// TODOChecks if the provided integer is a prime number.
// TODOExamples
// TODOReturns true if the given number is odd, false otherwise.
// TODOExamples
// TODOReturns the least common multiple of two or more numbers.
// TODOExamples
// TODOImplementation of the Luhn Algorithm used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers etc.
// TODOExamples
// TODOReturns the maximum value from the provided enumerable.
// TODOExamples
// TODOReturns the median of an array of numbers.
// TODOExamples
// TODOReturns the minimum value from the provided enumerable.
// TODOExamples
// TODOGenerates primes up to a given number, using the Sieve of Eratosthenes.
// TODOExamples
// TODOConverts an angle from radians to degrees.
// TODOExamples
// TODOReturns an array of n random integers in the specified range.
// TODOExamples
// TODOReturns a random integer in the specified range.
// TODOExamples
// TODOReturns a random number in the specified range.
// TODOExamples
// TODORounds a number to a specified amount of digits.
// TODOExamples
// TODOHashes the input string into a whole number.
// TODOExamples
// TODOReturns the standard deviation of an array of numbers.
// TODOExamples
// TODOReturns the sum of two or more numbers/arrays.
// TODOExamples
// TODOReturns the sum of an array, after mapping each element to a value using the provided function.
// TODOExamples
// TODOReturns the number of times a function executed per second.
hz is the unit for hertz, the unit of frequency defined as one cycle per second.
// TODOExamples
// TODOIterates over a callback n times
namespace Conplement.Snippets.Method
{
public static partial class Method
{
public static IList<T1> Times<T1>(Func<T1> func, uint times)
{
var list = new List<T1>();
for (var index = 0; index < times; index++)
{
list.Add(func());
}
return list;
}
}
}Examples
Method.Times((() => true), 3) # list of size 3, all values true
Method.Times(((int start, int end) => new Random().Next(start, end)), 6, 0, 100) # list of size 6 with 6 random integers between 0 and 100Returns the length of a string in bytes.
// TODOExamples
// TODOCapitalizes the first letter of a string.
// TODOExamples
// TODOCapitalizes the first letter of every word in a string.
// TODOExamples
// TODOReturns number of vowels in provided string.
// TODOExamples
// TODOConverts a comma-separated values (CSV) string to a 2D array.
// TODOExamples
// TODOConverts a comma-separated values (CSV) string to a 2D array of objects. The first row of the string is used as the title row.
// TODOExamples
// TODODecapitalizes the first letter of a string.
// TODOExamples
// TODOCheck if a string is ends with a given substring using a regex
The method excepts the string to test and a regex
Most other checks are already integrated into C# https://docs.microsoft.com/en-us/dotnet/api/system.string.endswith?view=netframework-4.7.2
namespace Conplement.Snippets.String
{
public static partial class String
{
public static bool EndsWithRegex(this string input, Regex regex)
{
return regex.IsMatch(input);
}
}
}Examples
"Hello World".EndsWithRegex(new Regex(@"[dolrwDOLRW]{5}$")) # trueEscapes a string for use in HTML.
// TODOExamples
// TODOEscapes a string to use in a regular expression.
// TODOExamples
// TODOConverts a string from camelcase.
// TODOExamples
// TODOIndents each line in the provided string.
// TODOExamples
// TODOReturns true if the given string is an absolute URL, false otherwise.
// TODOExamples
// TODOChecks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
// TODOExamples
// TODOChecks if a string is lower case.
// TODOExamples
// TODOChecks if a string is upper case.
// TODOExamples
// TODOReplaces all but the last num of characters with the specified mask character.
// TODOExamples
// TODOPads a string on both sides with the specified character, if it's shorter than the specified length.
// TODOExamples
// TODOReturns true if the given string is a palindrome, false otherwise.
// TODOExamples
// TODOReturns the singular or plural form of the word based on the input number. If the first argument is an object, it will use a closure by returning a function that can auto-pluralize words that don't simply end in s if the supplied dictionary contains the word.
// TODOExamples
// TODORemoves non-printable ASCII characters.
// TODOExamples
// TODOReverses a string.
// TODOExamples
// TODOAlphabetically sorts the characters in a string.
// TODOExamples
// TODOSplits a multiline string into an array of lines.
// TODOExamples
// TODOCheck if a string starts with a given regex.
// TODOExamples
// TODOGenerates all permutations of a string (contains duplicates).
// TODOExamples
// TODORemoves HTML/XML tags from string.
// TODOExamples
// TODOConverts a string to camelcase.
// TODOExamples
// TODOConverts a string to kebab case.
// TODOExamples
// TODOConverts a string to snake case.
// TODOExamples
// TODOConverts a string to title case.
// TODOExamples
// TODOTruncates a string up to a specified length.
// TODOExamples
// TODOUnescapes escaped HTML characters.
// TODOExamples
// TODOJoins all given URL segments together, then normalizes the resulting URL
// TODOExamples
// TODOConverts a given string into an array of words.
// TODOExamples
// TODOChecks if the provided value is of the specified type.
// TODOExamples
// TODOChecks if the provided argument is a valid JSON.
// TODOExamples
// TODOReturns the first non-null argument.
// TODOExamples
// TODOExtends a 3-digit color code to a 6-digit color code.
// TODOExamples
// TODOReturns an object containing the parameters of the current URL.
// TODOExamples
// TODOConverts a color code to a rgb() or rgba() string if alpha value is provided.
// TODOExamples
// TODOReturns the index of the function in an array of functions which executed the fastest.
// TODOExamples
// TODOConverts a number in bytes to a human-readable string.
// TODOExamples
// TODOGenerates a random hexadecimal color code.
// TODOExamples
// TODOConverts the values of RGB components to a color code.
// TODOExamples
// TODOMeasures the time taken by a function to execute.
Stopwatch documentation https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.stopwatch?redirectedfrom=MSDN&view=netframework-4.7.2
namespace Conplement.Snippets.Utility
{
public static partial class Utility
{
public static (long, T1) TimeTaken<T1>(Func<T1> func)
{
var watch = Stopwatch.StartNew();
T1 result = func.Invoke();
watch.Stop();
return (watch.ElapsedMilliseconds, result);
}
}
}Examples
Utility.TimeTaken(() => true) # 13.37ms, trueAdds an ordinal suffix to a number.
// TODOExamples
// TODOReturns true if the string is y/yes or false if the string is n/no.
// TODOExamples
// TODOYou're always welcome to contribute to this project. Please read the contribution guide.
This project is licensed under the MIT License - see the License File for details
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