Unit 5

List 3 Lists Practice

To do: December 13 - in your IN

• Declare a variable named family and assign to it a list of the first names of your family members (immediate family) including yourself. What data type will you use?
• Write code to print only your name referring to the variable name family.
• Write code that adds to the end of the list the first name of a member of your extended family. How do you add the name to the end of the list?

What is a list in JavaScript? an array

In JavaScript, you can use an array to keep a list of elements. An array is a data structure in JavaScript used to represent a list.

Vocabulary Review

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Unit 5 Lesson 3 - Warm Up

List -

Element -

Index -

an ordered collection of elements

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

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

Using list.length-1 to access last item in array

myArray[myArray.length-1]

var myArray = [3, -4, 5, 0, 7];�var last = myArray[myArray.length-1];�console.log(last);

>>

Using list.length-1 to access last item in array

myArray[myArray.length-1]

var myArray = [3, -4, 5, 0, 7];�var last = myArray[myArray.length-1];�console.log(last);

>> 7

Go over homework

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• goFormative U5L01 Lists Explore, U5L02 Lists Investigate
• Complete Khan Academy - Binary Review - articles/exercises

String commands

The characters in a string each have an index beginning with 0.

• string.length returns the length of a string (number of characters)
• string.substring(start,end) returns a portion of the string, beginning at the start index and ending with the character before the end index.

Example: �var city = "Houston";�console.log(city.length);�console.log(city.substring(3, 6);

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char

index

String commands

The characters in a string each have an index beginning with 0.

• string.length returns the length of a string (number of characters)
• string.substring(start,end) returns a portion of the string, beginning at the start index and ending with the character before the end index.

Example: �var city = "Houston";�console.log(city.length); 7�console.log(city.substring(1, 4); "ous"

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char

index

String commands

var name = "Debbie";

console.log(name.length);

console.log(name.substring(1,4));

console.log(name.substring(2,3));

console.log(name.substring(3,6));

console.log(name.substring(2,7));

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Complete Code.org U5L03 bubbles 1-10 - pair programming

Homework

• Complete Code.org U5L03 bubbles 1-10
• goFormative - U5L03 Lists Practice

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