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Linear combinations of $2 \times 2$ matrices. Three examples.

Multiplication of $2 \times 2$ matrices.

Find the determinant and inverse of three $2 \times 2$ invertible matrices.

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Given an ascending sequence of numbers, finds the index in the sequence of the first number greater than or equal to a given value.

Obosolete: there's now a built-in function sort_by.

Defines a custom function sort_by to sort a list of lists by the elements at the given index.

You could do a similar thing to sort lists of dictionaries.

Because JavaScript numbers lose precision as they get bigger, you get some unexpected results.

See the variable "two" - the difference should be 2, but because the JavaScript representation of each of the two numbers is the same, it thinks the difference is 0.

Using the decimal data type, there's no loss of precision, so the correct value is produced.

Pick from the range -5..5, but make 0 more likely.