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SassMeister-input-HTML.html

<script>
 
</script>
<iframe id=codepen src=http://www.codepen.io/pen?innerframe=true></iframe>

SassMeister-input.scss

// ----
// Sass (v3.3.7)
// Compass (v)
// ----

// ----
// Sass (v3.3.4)
@import "compass";
$icons: (
 social: (
  facebook: "fb", 
  twitter: "tweet", 
  google-plus: "+plus"
 ),
 arrow: (
  arrow-up: "^", 
  arrow-right: ">",
  arrow-down: "^^", 
  arrow-left: "<"
 ),
 special: "special-icon"
);

@function find-icon($a, $b: null, $icon-list: $icons){
 $set: map-get($icon-list, $a);
 @return if(type-of($set) != map, $set, map-get($set, $b));
}

$map-find:(
 item-1: "value-1",
 item-2: "value-2",
 map-1:(
  item-3: "value-3",
  item-4: "value-4",
  map-2:(
   item-5: "value-5",
   map-3: (
    item-7: "value-7",
    item-8: "value-8",
    map-4: (
     item-9: "value-9",
     item-10: "value-10",
     map-5: (
      item-11: "value-11"
     )
    )
   )
  )
 )
);

@function map-find($map, $a){
 $value: map-get(call(map-merge-this, $map), $a);
 @if $value == null{ @warn "#{$a} is not in #{$map}"; }
 @return $value;
}
// Map merge this
// @notes{ This is used to merge all the maps in a single map together as a single map }
@function map-merge-this($map){
 $tmp-map: ();
 @each $item, $value in $map{
  $tmp-map: map-merge($tmp-map, if(type-of($value) == map, $value, ($item: $value)));
 }
 @each $item, $value in $tmp-map{
  $tmp-map: if(type-of($value) == map, call(map-merge-this, $tmp-map), $tmp-map);
 }
 @return $tmp-map;
}

// icon-get
// @notes { This is used to get the value for the icons } 
@function icon-get($icon, $icon-map: $icons){
 $icon: call(map-find, $icon-map, $icon);
 @return $icon;
}

/* map-find() tests */
.map-find{
 test-1: map-find($map-find, item-1);
 test-2: map-find($map-find, item-2);
 test-3: map-find($map-find, item-3);
 test-4: map-find($map-find, item-4);
 test-8: map-find($map-find, item-8);
 test-10: map-find($map-find, item-10);
 test-11: map-find($map-find, item-11);
}

/* icon-get() tests */
.icon-get{
test-1: icon-get(facebook);
// test-2: ;
// test-3: ;
// test-4: ;
}

SassMeister-output.css

/* map-find() tests */
.map-find {
  test-1: "value-1";
  test-2: "value-2";
  test-3: "value-3";
  test-4: "value-4";
  test-8: "value-8";
  test-10: "value-10";
  test-11: "value-11";
}

/* icon-get() tests */
.icon-get {
  test-1: "fb";
}

SassMeister-rendered.html

<script>
 
</script>
<iframe id=codepen src=http://www.codepen.io/pen?innerframe=true></iframe>