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[MUSIC]

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JavaScript has built-in data types that
describe the different types of values or

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data that you work with and
store in variables.

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JavaScript treats each data
type in a different way.

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In a previous course,
you learned about strings.

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A string is a series of letters,
numbers, and

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other characters enclosed
in quotation marks.

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Strings are one of the most common data
types you'll work with in JavaScript.

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You also worked with Booleans,

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a data type that represents one of
two possible values, true or false.

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For example,
did the user enter the correct password,

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the outcome is either true or false.

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This course is all about another really
important data type you'll frequently

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encounter and work with in JavaScript,
numbers or numeric data types.

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You use numbers for
tasks involving counting or calculating.

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For example, determining the total
cost of items in a shopping cart,

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adding points to a player's
score in a game.

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Or keeping track of how many
likes a blog post receives.

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I'm Guil, a developer and
JavaScript instructor here at Treehouse.

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In this course,
I'll teach you how to use numbers for

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all sorts of useful tasks in
your JavaScript programs.

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Including doing basic and complex math,
converting strings to numbers,

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even generating random numbers to add
variety and surprise to your program.

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You're also going to get lots of
opportunities to make what you're learning

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stick, with quizzes, code challenges,
and practice exercises.

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To help you succeed, you should have
completed the prerequisites for

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this course, where you learned
the basics of the JavaScript language.

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Let's get started by first reviewing how
numbers are represented in JavaScript.