exercism/elixir/boutique-inventory/HINTS.md

Hints

General

• Read about the Enum module in the official Getting Started guide or on elixirschool.com.
• Take a look in the documentation for the full list of functions in the Enum module.

1. Sort items by price

• There is a built-in function for sorting enumerables using a sorter function.

2. Find all items with missing prices

• There is a built-in function for filtering enumerables.

3. Update item names

• There is a built-in function for transforming every element in an enumerable.
• There is a built-in function that can replace all instances of one string with a different one.

4. Increment the item's quantity

• Maps implement the enumerable protocol.
• Enum functions convert maps to a list of {key, value} tuples.
• There are two different functions that can transform a list of {key, value} tuples back into a map using a transformation function. One of them always returns a new map, while the other lets you choose a collectible.

5. Calculate the item's total quantity

• Maps implement the enumerable protocol.
• Enum functions convert maps to a list of {key, value} tuples.
• There is a built-in function for reducing an enumerable to a single value.