List, Loops, and Traversals

Lists

• Named the same as variables

• Can contain multiple elements

• Index starts at 0

• Each number(index) contains one value

What is true about var myList=["pizza",4]

• The command creates a new list and assigns it to a variable

• A list is indicated with square brackets

• Each value in the list is separated by commas

What is true about myList[1]

• It accesses the value at that index of the list

• Also uses square brackets

What does myList[1]="hello" do?

• Assigns the value on the right to the index

• Throws out the old value and replaces it with a new one.

What does removeItem(list, index) do?

• Removes the element in the given list at the given index

• All items to the right are shifted over

• The last index is removed from the list

What does appendItem(list,item) do?

• Adds an element to the end of the list

• A new index is added to the list to create a place for the element

• The new item is placed in this new index

What does insertItem(list, index, item) do?

• Inserts an element into a list at the index given

• A new index is added to the list so there's space for the new element

• The new element is placed at the index given, all other items move right

An ordered collection of elements

• List

• Index

• Element

• Bracket

Is an individual value in a list that is assigned a unique index

• Element

• Index

• List

• Bracket

A common method for referencing the elements in a list or string using numbers

• Index

• Bracket

• List

• Element