How are positional arguments different from keyword arguments?

Position arguments must be passed in the same order as they are defined in the function signature. They are typically mandatory, but can be made optional when default values are provided. Keyword arguments can be passed in any order that they are written, and they are optional when default value is not provided.

What is the difference between splatting and slurping?

Splatting and slurping have the same syntax but mean different things in different contexts. Splatting refers to the automatic assignment of function arguments from a tuple or array. Slurping refers to the process of passing multiple function arguments, which becomes a single tuple variable accessible from the body of the function.

What is the purpose of do-syntax?

Do-syntax is a convenient way of formatting a block of code that is needed to be wrapped as an anonymous function and passed to another function. It makes the code much more readable.

What tool is available for detecting method ambiguities as related to multiple dispatch?

The detect_ambiguities function from the Test package can be used to detect method ambiguities within a single module or across multiple modules.

How do we ensure that the same concrete type is passed to a function in a parametric method?

A convenient way to ensure that the same concrete type is passed for the arguments of a function is to designate these arguments as a type parameter (for example, T). Note that this works as long as the type parameter is used as a standalone type rather than part of a parametric type, for example, AbstractVector{T}.

How are interfaces implemented without any formal language syntax?

Interfaces can be implemented according to the contract specified by the designer of the interface even though there is no formal syntax in Julia for specifying interfaces.

How do we implement traits, and how are traits useful?

A trait can be implemented by a function that takes the specific data type(s) and returns a flag. Normally, a trait is defined to return a Boolean value, that is, whether the trait exists or not. However, it can also be designed to return multiple values to indicate various kinds of trait. Traits are useful if the developer needs to programmatically figure out whether a data type (or combination of data types) exhibits a specific behavior.