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# Tutor profile: Mike S.

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Mike S.
Software Engineer at Lockheed Martin, Computer Vision Developer at Nervve Technologies
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## Questions

### Subject:Python Programming

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Question:

How does list comprehension work in Python?

Inactive
Mike S.

List comprehension is a way to create a new list by applying some expression to all the elements of an iterable. It will take the following form: [ <expression> for <element> in <iterable> ] It can also have an optional "if" conditional applied at the end: [ <expression> for <element> in <iterable> if <condition> ] Every <element> in the <iterable> is applied to the <expression>. If there is a <condition>, it will only be applied if it evaluates to true . The results are returned in a new list. To create a list of cubed integers: cubed_list = [x * x * x for x in (1, 2, 3, 4)] # cubed_list: [1, 8, 27, 64]

### Subject:C++ Programming

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Question:

How can the elements of a STD vector be accessed in C++?

Inactive
Mike S.

This can be done either with the subscript operator [], or the member function at(). Both of these approaches return a reference to the element at the given position in the std::vector. Using [] must be done with care, as it does not perform any bounds checking. Using at() function will always perform bounds checking. Accessing elements where index < 0 or index >= size is undefined behavior for [], while at() throws a std::out_of_range exception. Here are some examples of both techniques: std::vector<int> my_vector{ 1, 2, 3 }; // approach using [] int my_val = my_vector[2]; // my_val is 3 my_vector[1] = 9; // my_vector now contains { 1, 9, 3 } // using at() int my_val = my_vector.at(1); // my_val is 9 my_vector.at(2) = 22; // my_vector now contains { 1, 4, 22 } int my_val2 = my_vector.at(3); // throws std::out_of_range exception // ERROR below: unknown and unpredictable behavior int my_val3 = my_vector[3];

### Subject:C Sharp Programming

TutorMe
Question:

In the C# programming language, how are tuples returned in a method?

Inactive
Mike S.

Tuples are used as a way to work with one single entity representing a collection of data elements. In C#, methods can have multiple return values. The compiler will see these multiple values and use the ValueTuple struct. Here is a sample method that will return a tuple given the values for hour and minutes. public (int tuple_hour, int tuple_cents) GetTupleTime(int hour, int minutes) { return (hour, minutes); }

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