dry-rule.md

Do not Repeat Yourself - DRY rule

vs. Write Everything Twice - WET rule

Following the WET rule will:

• Increase the difficulty of change
• Decrease clarity
• Leads to opportunities for inconsistency

To prevent duplication and follow the DRY rule, we can write custom functions.

• AwesomeFunctionName <- function(argument1, argument2,…){ do stuff here }

To build up a function, start by writing the "stuff" to test that it works outside the function.

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YOUR TURN:
Create a function that draws a histogram of nrep mean(rnorm(100))
Modify your function to draw a histogram of nrep mean(rnorm(n))

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