Given a decimal number `num`, this function approximates/selects it's value upto `n` decimal places.

Given a precision value as an integer, this function returns the corresponding error value

Given a collection, this function finds the number of zero elements of the collection from the start

Calculates the mean of a collection `c`

Rationalises a number into a fraction, same as `clojure.core/rationalize`
But this will always return the numerator as is, without the decimal
Hence the denominator will be in multiples of 10

Replaces `n`th item from `coll` with `replacement`

Rounds of a decimal based on `precision`

Generate shingles out of a string `s` (could also work with other types of collections)
The shingle size is specified by `n`
If `s` is a very small string (of count less than or equal to 5),
just a list of it's individual chars is returned