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Create a Program with Math
2:51Build a short program that helps you calculate the number of seconds in a day, hours in a week, or minutes in a year.
All right,
let's do some math with JavaScript.
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You'll build a simple program that can
help you calculate the number of seconds
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in a day, hours in a week,
or minutes in a year.
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You can code along with me by launching
the workspace with this video.
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Open the math.js file
located inside the js folder.
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The file is already linked to index.html.
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Let's start by creating a few variables
that hold information about time.
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First, declare a variable
named seconds per minute,
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that stores the number of
seconds in a minute, 60.
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Then declare for more variables for
other length of time.
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First minsPerHour = 60,
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then const hoursPerDay = 24,
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and const daysPerWeek = 7,
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and const weeksPerYear = 52.
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With this information,
we can now start to do some math.
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Let's put a message to the console that
lists the number of seconds in a day.
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I'll type a set of backticks
to create a template literal
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that displays the message,
there are dollar sign curly braces
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secondsPerDay seconds in a day.
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We can calculate the number of seconds in
a day by multiplying the number of seconds
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in a minute by the number of minutes in
an hour and the number of hours in a day.
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Above console.log, I'll declare
the variable secondsPerDay and
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assign it secondsPerMinute times
minsPerHour times hoursPerDay.
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Now the variable secondsPerDay holds
the number of seconds in a day.
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As you can see in the console,
there are 86,400 seconds in a day.
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Here's a small assignment for you.
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Add another variable named yearsAlive and
assign it your age.
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Then print a second message to the console
by adding another console.log statement.
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The message should say,
I've been alive for more than x seconds.
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Replace the x with the number of seconds
that have elapsed in all the years you've
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been alive.
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You'll need to do some multiplication
of variables to get it done.
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So good luck, and
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when you're done, why don't you share your
solution with other Treehouse students?
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