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5/5

a!localVariables(): write a basket summary with free delivery

Hard

A checkout page sums up the basket in one line and says how far the shopper is from free delivery, which starts at a total of $50:

  • under $50: "3 items, total $22, add $28 for free delivery"
  • $50 or more: "2 items, total $55, free delivery"
  • a single item reads "1 item", not "1 items"
  • nothing in the basket: "Basket is empty"

The count and the total each appear in more than one place. Work each out once and name it.

Input

  • ri!prices: List of Integer

ri! Rule Inputs

ri!pricesList of Integer
{
  10,
  5,
  7
}

Example 1: Short of free delivery

Input: ri!prices
{
  10,
  5,
  7
}
Output:
"3 items, total $22, add $28 for free delivery"

Example 2: Free delivery reached

Input: ri!prices
{
  30,
  25
}
Output:
"2 items, total $55, free delivery"

Example 3: Exactly $50 qualifies

Input: ri!prices
{50}
Output:
"1 item, total $50, free delivery"

Example 4: A single cheap item

Input: ri!prices
{4}
Output:
"1 item, total $4, add $46 for free delivery"

Example 5: An empty basket

Input: ri!prices
{}
Output:
"Basket is empty"

Appian Expression Tips

  • • Use ri!variableName for rule inputs
  • • Use a!localVariables(local!x: …, body) for locals
  • • Use a!forEach(items: …, expression: fv!item) to iterate
  • • Use where() / reject(fn!isnull, list) to filter