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→Built-in functions
* Count(func) – Returns how many elements satisfy func(x)
* Count(func) – Returns how many elements satisfy func(x)
* Where(func) – Returns elements that satisfy func(x)
* Where(func) – Returns elements that satisfy func(x)
* First() - Returns the first element of the enumrable or null
* Last() - Returns the last element of the enumerable or null
* FindFirst(func) – Returns the first element that satisfies func(x)
* FindFirst(func) – Returns the first element that satisfies func(x)
* OrderBy(func) – Returns elements sorted by func(x) in ascending order
* OrderBy(func) – Returns elements sorted by func(x) in ascending order