Generated by SassMeister.com.

SassMeister-input-HTML.html

<h5></h5>

SassMeister-input.scss

// ----
// Sass (v3.4.3)
// Compass (v1.0.1)
// Sassy Maps (v0.4.0)
// ----

@import "sassy-maps";


$map-1:(
  alpha: 1,
  beta: 1,
  charlie:(
    delta: 1,
    echo: 1,
    foxtrot:(
      gamma: 1,
      hotel: 1
    )
  )
);

$map-2:(
  alpha: 2,
  charlie: (
    echo: 2,
    foxtrot: (
      hotel: 2,
      yankee:(
        omega: 2
      )
    )
  ),
  indigo: (
    juliette: 2
  )
);

  // Note that these maps are merged to:
  // (
  // alpha: 2, 
  // beta: 1,
  // charlie: (
  //   delta: 1,
  //   echo: 2,
  //   foxtrot: (
  //     gamma: 1,
  //     hotel: 2,
  //     yankee: (
  //       omega: 2
  //     ), 
  //     indigo: (
  //       juliette: 2
  //     )
  //   )
  // )
 
@function map-merge-deep($map-old, $map-new, $overwrite: true){
  // Iterate through each value of the new map
  @each $key, $new-value in $map-new {
    // Check if that value already exists on the old map
    @if map-has-key($map-old, $key) {
      
      $old-value: map-get($map-old, $key);
      $new-value-is-map: type-of($new-value) == map;
      $old-value-is-map: type-of($old-value) == map;
      
      // If both are maps, recurse regardless of $overwrite
      @if $old-value-is-map and $new-value-is-map {
        $merged-value: map-merge-deep($old-value, $new-value);
        $map-old: map-set($map-old, $key, $merged-value);
      }@else{
        // Otherwise check $overwrite
        @if $overwrite{
          $map-old: map-set($map-old, $key, $new-value);
        }
      }
    // There is no existing key so add
    }@else{
      $map-old: map-set($map-old, $key, $new-value);  
    }
  }
  @return $map-old
}

@mixin merge{
  $map-1: map-merge-deep($map-1, $map-2) !global;
  // content: "#{inspect($map-1)}";
  $value: map-get-deep($map-1, charlie, foxtrot, hotel);
  content: "#{map-to-string($map-1)}";
}

h5::after
{
  @include merge;
}

SassMeister-output.css

h5::after {
  content: "(alpha: 2, beta: 1, charlie: ((delta: 1, echo: 2, foxtrot: ((gamma: 1, hotel: 2, yankee: ((omega: 2)))))), indigo: ((juliette: 2)))";
}

SassMeister-rendered.html

<h5></h5>