I'm trying to get the index of an item in a nested SASS list — by the first property. But the only way i can get a result is to include both properties in the item. 

Is is doable with native SASS, or would it require a mixin/function? And any input to how i would do that?   

The code i got:

$icons : (
  'arrow--down--full' '\e806', /* '' */
  'cog' '\e805', /* '' */
  'info' '\e807', /* '' */
  'arrow--down' '\e800', /* '' */
  'arrow--left' '\e801', /* '' */
  'arrow--right' '\e802', /* '' */
  'arrow--up' '\e803',  /* '' */
  'close' '\e804', /* '' */
  'search' '\e804', /* '' */
  'spin' '\e809' /* '' */
);


And my lookup

//Working
index($icons, 'search' '\e804');

//Not working, but what i want to achieve
index($icons, 'search');



Question: What kind of dose can you expect from a radioactive lens?
Answer: It should also be noted that the conversion rate between Rems and Seiverts is 1 mR = 10 µSv. So if a chest x-ray is 10mR (according to the article @rfusca linked), thats about 100µSv. According to the chart, that is equivalent to the approximate total dose received at Fukishima Town Hall over a full two weeks, and just shy of half what those two Fukishima workers received that will likely make them a little sick for a while, but is easily treatable. 

If you examine the full XKCD radiation chart, an x-ray dose is about 1000 times more than the amount of radiation you get off of a radioactive lens at its surface. The lowest dose of possibly cancer-causing ionizing radiation is 10,000 times more, and the lowest possibly deadly dose of ionizing radiation is about 2 million times more, than the amount of radiation you get off of a radioactive lens at its surface. You would need to encounter 4 million - 8 million times more radiation than a radioactive lens releases, in a single dose or continual ongoing short-term exposure, to encounter truly life-ending radiation.

You probably get more radiation from the sun in a day than you get from a radioactive lens. ;)