[swift-users] Swift BMI

[Erica Sadun]

And, of course, this is a perfect opportunity to use Swift tuple returns and eliminate the side-effect of printing the numeric value:

http://swiftstub.com/176972405

-- E, whose kids have a snow day this morning in case you can't tell


> On Dec 15, 2015, at 7:20 AM, Erica Sadun <erica at ericasadun.com> wrote:
> 
> In fact, there's no really good reason to use any construct, whether struct, class, or enum, for this at all since the BMI isn't a "thing" per se.  A global function might be a better fit.
> 
> http://swiftstub.com/443052056 <http://swiftstub.com/443052056>
> 
> -- E
> 
>> On Dec 15, 2015, at 7:10 AM, Eimantas Vaiciunas via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> 
>> I exchanged a class to an enum since the BMI values are a finite set. This eliminates a need for valid value check since the switch that is used to initialise the enum value is exhaustive.
>> 
>> http://swiftstub.com/242291010/ <http://swiftstub.com/242291010/>
>> 
>> On Tue, Dec 15, 2015 at 3:30 PM, Erica Sadun via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> Leaving aside typos, any discussion about the merits of BMI, and the intemperate language in the code, you do a few things that could be improved upon language-wise. Of these, the most egregious is the final "break the machine" else statement that can never be reached.
>> 
>> The following example does several things:
>> http://swiftstub.com/358512527 <http://swiftstub.com/358512527>
>> 
>> * Adds a precondition to ensure that clients have passed valid arguments
>> * Uses an enumeration (with a default value) instead of overloading a class function with nearly identical code
>> * Introduces a multiplier to address the kg/lb difference
>> * Establishes an upper case name for the class
>> * Uses a switch statement instead of cascaded ifs 
>> * Returns a String instead of running procedurally
>> 
>> -- E
>> 
>> 
>>> On Dec 14, 2015, at 8:20 PM, Gage Morgan via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>>> 
>>> For most languages I try out, my own version of "Hello World!" is a BMI calculator. Swift has passed, I encourage you to try it out. 
>>> 
>>> There are two methods called towards the end of file:
>>> 1) bmi.pounds(weight, height) - Replace numbers inside with your own if you want to test out in US Customary units. 
>>> 
>>> 2) bmi.kilograms(weight, height) - Replace numbers inside with your own if you want to test out in Metric units used everywhere outside the US. 
>>> 
>>> You already get the gist, the bits can be found here:
>>> https://gist.github.com/anonymous/9284017644567c29c7f8 <https://gist.github.com/anonymous/9284017644567c29c7f8>
>>> 
>>> If there's a bug please let me know, but it works in IBM's Sandbox. 
>>> (Yes, ALL code was written by me without help. Very close to C, just a bit laid back.)
>>> --MGage--
>>> 
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>> 
>> 
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