IB computer science HL October 11 2016 Lesson Notes

What are we going to learn today?[edit]

Today in class we will start learning about collections and arrays. THESE ARE DIFFERENT.
If using weapons as array examples offends you, please use this potion list as an alternative.

<?php

# this file is used to teach the VERY BASICS of arrays in PHP

$shop_items = array(
  "short sword",
  "dagger",
  "flail",
  "morning star",
  "spear",
  "long bow",
  "crossbow",
  "long sword",
  "two handed sword",
  "scimitar",
  "short bow",
  "staff",
  "club"
  );

# This creates a very simple array.
# We can perform some different operations on this array:

# count the items in the array: 

echo "<p>Welcome to our shop. We sell many things for adventurers </p>";
echo "<p>==========================================</p>";

# let's list our inventory:

for ($i = 0; $i < count($shop_items); $i++)
{

echo $i  . " - $shop_items[$i] <br />";

}
?>

Below we have an example if an associative array:

<?php

# this file is used to teach the VERY BASICS of arrays in PHP

$shop_items = array(
  "short sword" =>"10",
  "dagger" => "2",
  "flail" => "12",
  "morning star" => "15",
  "spear" => "25",
  "long bow" => "15",
  "crossbow" => "20",
  "long sword" => "21",
  "two handed sword" => "30",
  "scimitar" => "18",
  "short bow" => "15",
  "staff" => "5",
  "club" => "2"
  );

# This creates a very simple array.
# We can perform some different operations on this array:

# count the items in the array: 

echo "<p>Welcome to our shop. We sell many things for adventurers </p>";
echo "<p>==========================================</p>";

# let's list our inventory:

foreach ($shop_items as $i => $cost_of_item)
{

echo $i  . " costs $cost_of_item <br />";

}
?>

Homework[edit]

Please review our page about collections and arrays

How am I being assessed today?[edit]

You will be formatively assessed in class today

Standards we are covering today[edit]

Describe the characteristics and applications of a collection.
Construct algorithms using the access methods of a collection.
Click here for all our standards

As a computer scientist, you have:[edit]

Confidence in dealing with complexity
Persistence in working with difficult problems
Tolerance for ambiguity
The ability to deal with open-ended problems
The ability to communicate and work with others to achieve a common goal or solution

Credits[edit]

Icons used with tremendous gratitude by Freepik from flaticon