Change given string to number. (hint: there is already function)
Changing from ['1234'] to  is one of example
Please expand the test suite so that solutions like this do not work.
Back to basics 25 - Valid variable names
Arrange vector in ascending order
07 - Common functions and indexing 1
Reverse a string
Replace 0 to NaN!
Solve equation numerically
Calculate some equation
Analyze observation data
Interpolate scattered data.
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