This unit we'll be pulling together all of the Javascript techniques you've learned thus far as well as practicing with HTML & CSS.
- variables
- arrays
- conditionals
- functions
- HTML & CSS
In this section we will write some functions that might be used in a simple cart system for a store.
Update the cart.js
file to do the following:
-
Create a global variable named
basket
and set it to an empty array. -
Create a function called
addItem
. It should:- take an input parameter for a string
item
- add the new item to the global array
basket
. - return
true
indicating the item was added
- take an input parameter for a string
-
Create a function called
listItems
. It should:- loop over the items in the
basket
array - console.log each individual item on a new line
- loop over the items in the
-
Create a function called
empty
. It should:- reset the
basket
to an empty array - do not use
basket = []
to reset the array
- reset the
IMPORTANT Make sure that you are writing code in the file to test every function that you write!
For example, to test addItem
:
console.log(`Basket is ${basket}`);
console.log('Adding apples (expect true)', addItem('apples'));
console.log(`Basket is now ${basket}`);
Remember that Stretch Goals are not required, but will help you to further develop concepts from the skills we have covered.
Using functions in other functions!
-
Add a global
const
namedmaxItems
and set it to 5. -
Create a function called isFull(). It should:
- return
false
if the basket contains less than max number of items - return
true
otherwise (equal or more than maxItems)
- Update the required
addItem
function to:
- Use the
isFull
function to prevent more thanmaxItems
from being added to the basket. - If an item was added to the array, return
true
- If there was no room and the item could not be added return
false
Using Array built-in functions!
- Create a function called
removeItem
. It should:
- Take an input parameter for a string
item
- Use Array.indexOf to find the index of the first matching item in the basket.
- Use Array.splice to remove the first matching item from the basket.
- Return the item removed or
null
if the item was not found
Check in your repo, then turn in your work via the Prime Academy Assignment Application at http://primeacademy.io, as usual and don't hesitate to hit up the Slack channel as needed!
REMINDER: Make sure to answer the Slack discussion question for this week!