Write Attestant Default with airSlate SignNow

Write awardee default

This video is about setting defaults  for arguments in the functions we create   allowing those arguments to be optional arguments. As we've seen when working with functions from  packages some of the arguments are optional;   we don't always have to provide those arguments.  And the reason they are optional is because they   have default values associated with them,  or values that get used if we don't provide   that argument when we call the function. And  these can be useful in cases where we have   common inputs that we generally want to use and  only want to change under some circumstances. And so we'll go back to the example that we've  been working on so far where we're calculating a   shrub volume from the length, width, and height of  that shrub. And let's say for example that many of   our shrubs are the same height and so when we're  in the field we only collect the length and width   of those shrubs and then only measure the height  when it's different from this common height.   We can take this into account in our function  by setting a default height that will be used   if we don't provide the function one, so for those  cases where we haven't actually measured a height.   To do this we go inside these parentheses where  we define the names of the input arguments,   and after any argument that we want to provide a  default value for we put an equal sign and then   whatever that default value is. And so let's  say most of our shrubs are one meter high,   then we can set the default value equal to 1. And so now we need to rerun this  code so that we recreate the function   with the changes that we've made. It's  a common mistake to change something   in the function and then forget to re-run the  function code itself to redefine the function.   And so now we can still rerun this function  the way we have before if we want to,   and we'll get the same results back out,  but we can also now run the function with   only a single, with only the first two arguments  0.8 for the 'length' and 1.6 for the 'width'.   And if we do this what happens is  that 0.8 gets assigned to 'length',   1.6 gets assigned to 'width', and because  there's no argument provided for 'height'   our function will use this default value of 1.  And so it's used 1 instead of 2 and we can see   that the calculation is half as large because we  multiplied by a number that was half as big here. So that's the basic idea behind how to set  defaults for arguments in our own functions   allowing us to treat those as optional arguments.  We add an equal sign after the name of the   argument in our function definition and then after  that we include the default value. We can then run   the function either with all of the arguments that  we...