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The error functions we've written so
far, have had no arguments.

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What do they look like
if there are arguments?

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Let me show you.

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First, let's create error functions
that take a single argument.

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Open up the second JavaScript file, and
we're going to modify the function square,

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and cube for each function let set
up variables with appropriate names.

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Square, And cube.

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Next, remove the function keyword and
each of the functions names.

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Finally, add arrows to
each of the functions.

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As you can see,

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the syntax is exactly the same with
a single argument as with no arguments.

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Let's see what's an arrow function
looks like with multiple arguments.

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Open up the third file and let's convert
multiply into an error function.

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Start by assigning the function
to a multiply constant variable.

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Then, remove the function keyword and
the function name.

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Finally, at the arrow.

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There's also add and subtract here.

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These need to be converted to our syntax,
too.

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Why don't you convert these for practice?

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In the next video,

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we'll take a look at an even more
concise way to write our functions.