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DRY
4:29Keep your code free from repeats.
Repeating yourself is a common
mistake new programmers make.
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It can be easy when creating a project
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to not notice you've created the same
variable twice, or repeated some steps.
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Every coder creates repeat
code at one time or another.
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DRY or don't repeat yourself is
a great acronym to keep in mind as you
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code to help you remember to review
your work and check for those repeats.
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The best way to see how DRY
works is to see it in action.
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Let's tackle some repeats,
open the DRY file and let's dive in.
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In this file are two
lists with items inside.
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Below, I'm converting the price
into numbers instead of strings for
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both fruits and vegetables.
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Lastly, I'm adding another
key value pair to each.
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There's a lot of repeating going on here.
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One way to tackle this is to use for
loops.
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Let's try it and
see what our code looks like.
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For fruit in fruits,
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Tab this over and
we can remove the number and the s.
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And delete the extras.
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For vegetable in vegetables,
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same thing, tab over, remove the index and
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the s and remove the excess.
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For fruit in fruits,
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Remove the index and s, remove the excess,
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And one more time for
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vegetable in vegetables, tab,
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index and s, remove the excess.
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Already a lot cleaner, right?
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Well, this is definitely better, our code
here is still repeating the same tasks.
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We're repeating the tasks to translate
the price string into a number and
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the task to add a location.
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Let's make these two tasks into functions.
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The first we can call convert_price.
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It will take the list we want
to work with as a parameter,
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then we can use the same for
loop, To convert the price.
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We just need to change out fruits
to list and fruit to item.
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Item and item.
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Now all we need to do is get rid
of the vegetable version, and
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call our function twice
with our two lists.
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Let's do the same thing for our second
function and call it add_location
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Now, we're not repeating for loops either.
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Most of the time when I see repeated code,
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it means I need to convert
it into a function.
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You've tackled creating more dry code,
awesome.
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