Partitioning Operators

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int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

var first3Numbers = numbers.Take(3);

Console.WriteLine("First 3 numbers:");

foreach (var n in first3Numbers)

{

Console.WriteLine(n);

============================================================================

{

int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

var allButFirst4Numbers = numbers.Skip(4);

Console.WriteLine("All but first 4 numbers:");

foreach (var n in allButFirst4Numbers)

{

Console.WriteLine(n);

}

}

Result

All but first 4 numbers:

9

8

6

7

2

0

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Take While

int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

var firstNumbersLessThan6 = numbers.TakeWhile(n => n < 6);

Console.WriteLine("First numbers less than 6:");

foreach (var n in firstNumbersLessThan6)

{

Console.WriteLine(n);

}

First numbers less than 6:

5

4

1

3

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Skipwhile

int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

var allButFirst3Numbers = numbers.SkipWhile(n => n % 3 != 0);

Console.WriteLine("All elements starting from first element divisible by 3:");

foreach (var n in allButFirst3Numbers)

{

Console.WriteLine(n);

}

All elements starting from first element divisible by 3:

3

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Aggregate OPERATORS

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int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

int oddNumbers = numbers.Count(n => n % 2 == 1);

Console.WriteLine("There are {0} odd numbers in the list.", oddNumbers);
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double startBalance = 100.0;

int[] attemptedWithdrawals = { 20, 10, 40, 50, 10, 70, 30 };

double endBalance =
attemptedWithdrawals.Aggregate(startBalance,
(balance, nextWithdrawal) =>
((nextWithdrawal <= balance) ? (balance - nextWithdrawal) : balance));

Console.WriteLine("Ending balance: {0}", endBalance);
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Element Operators in linq.

string[] strings = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };



string startsWithO = strings.First(s => s[0] == 'o');



Console.WriteLine("A string starting with 'o': {0}", startsWithO);


======================================================

int[] numbers = { };



int firstNumOrDefault = numbers.FirstOrDefault();



Console.WriteLine(firstNumOrDefault);

output 0
================================================