Map-push function (adds item to list in map)

SassMeister-input.scss

// ----
// Sass (v3.4.5)
// Compass (v1.0.1)
// ----

// Initial hash
$hash: (
  hello: world denver pittsburgh,
  key: value list,
);

// Push Function
@function map-push($map, $key, $value) {
  @return map-merge($map, ($key: append(map-get($hash, $key), $value)));
}


// Before
.hash-before {
  @each $key, $value in $hash {
    #{$key}: $value;
  }
}


// Usage
$hash: map-push($hash, hello, texas);


// After
.hash-after {
  @each $key, $value in $hash {
    #{$key}: $value;
  }
}

SassMeister-output.css

.hash-before {
  hello: world denver pittsburgh;
  key: value list;
}

.hash-after {
  hello: world denver pittsburgh texas;
  key: value list;
}