One Pager Cheat Sheet

• The code snippet above is a pure function because the output is solely dependent on the input variables and not on any external environment, as it does not contain any variable declared outside of the function.
• The non-deterministic nature of the impure function in code snippet 2, due to external variables, makes it inherently unpredictable.
• A pure function has a 1-to-1 correspondence between input and output, while an impure function has a 1-to-many correspondence due to its dependence on outside variables.
• True, a pure function can be used to create a 1-to-many relationship between input and output.
• Pure functions are deterministic and reliable as their output is solely determined by the values of the input parameters and does not depend on global variables.
• A nested function system is considered pure if it does not trigger any side effects such as an HTTP request, mutation of data, printing to a screen, DOM manipulation or Math.random().
• The function maxplusone is a pure function with no side effects, as it only calls Math.max() and adds one to its result.