[CoffeeScript] Level 4 Arrays, Objects, Iterations -- Ex

Coffee on the Range

Create an array with numbers 1 until 10 using the inclusive (two dot) range syntax.

[1..10]

 

Coffee on the Range II

Create an array with numbers 1 through 10 using the exclusive range syntax.

Exclusive ranges are defined using three dots between integers, inside square brackets
[1...6]

Exclusive ranges do not include the last number.
values = [1...5]
# this expands to [1, 2, 3, 4]

The answer is
[1...11]

 

Object Literals

Create a variable named coffee which is an object with a name property set to 'Russian', alevel property set to 2 and an isRussian property which holds a function that returns true. Use an object literal.

coffee = 
  name: 'Russian'
  level: 2
  isRussian: ->
    true

 

or In Loop

Using the for element in collection loop, iterate over the people collection and print the names of people over 18 years old (person.age > 18). Use the console.log function to print the person.name.

for person in people
　　console.log(person.name) if person.age > 18

 

List Comprehension

Modify the loop below to use a list comprehension.

console.log "#{person.name}" for person in people when person.age > 18

 

List Comprehension II

Refactor the code below to make use of list comprehension.

addCoffee coffee for coffee in coffeeList when not coffee.isRussian?()

 

Splat Arguments

Change the displayTopPicks function to accept a variable number of suggested coffees by using the splat operator. Use suggested.join(", ") to alert all of the suggested coffees.

displayTopPicks = (bestCoffee, suggested...) ->
  alert('Top #1 ' + bestCoffee)
  alert('Suggested: ' + suggested.join(","))