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SassMeister-input.scss

// ----
// Sass (v3.2.19)
// Compass (v0.12.6)
// ----

// `map-get` polyfill
// ---
// @param [list] $map: map to fetch
// @param [literal] $key: key to find
// ---
// @return [literal] | [null]
// ---
@function map-get($map, $key) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  @each $tuple in $map {
    @if key($tuple) == $key {
      @return value($tuple);
    }
  }
  
  @return null;
}

// `map-has-key` polyfill
// ---
// @param [list] $map: map to fetch
// @param [literal] $key: key to find
// ---
// @return [bool]
// ---
@function map-has-key($map, $key) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  @each $tuple in $map {
    @if key($tuple) == $key {
      @return true;
    }
  }
  
  @return false;  
}

// `map-keys` polyfill
// ---
// @param [list] $map: map to extract keys from
// ---
// @return [list]
// ---
@function map-keys($map) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  $keys: ();
  
  @each $tuple in $map {
    $keys: append($keys, key($tuple));
  }
  
  @return $keys;
}

// `map-values` polyfill
// ---
// @param [list] $map: map to extract values from
// ---
// @return [list]
// ---
@function map-values($map) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  $values: ();
  
  @each $tuple in $map {
    $values: append($values, value($tuple));
  }
  
  @return $values;
}

// `set-nth` polyfill
// ---
// @param [list] $list: list to update
// @param [number] $index: index to update
// @param [literal] $value: new value
// ---
// @return [list]
// ---
@function set-nth($list, $index, $value) {
  $new-list: comma-list();
  
  @for $i from 1 through length($list) {
    $new-list: append($new-list, if($i == $index, $value, nth($list, $i)));
  }
  
  @return $new-list;
}

// `map-merge` polyfill
// ---
// @param [list] $map: map to update
// @param [list] $submap: map to merge
// ---
// @return [list]
// ---
@function map-merge($map, $submap) {
  // Fixing list length when single item map to merge
  @if length(nth($submap, 1)) == 1 {
    $submap: append((), $submap);
  }
  
  @if not is-valid-map($map) or not is-valid-map($submap) {
    @return throw();
  }

  @each $tuple in $submap {
    @if not map-has-key($map, key($tuple)) {
      $map: append($map, $tuple);
    }
    
    @else {
      $index: map-index($map, key($tuple));
      $map: set-nth($map, $index, $tuple);
    }
  }
  
  @return $map;
}

// `map-remove` polyfill
// ---
// @param [list] $map: map to update
// @param [literal] $key: key to remove
// ---
// @return [list]
// ---
@function map-remove($map, $key) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  @if not map-has-key($map, $key) {
    @return $map;
  }

  @return remove-nth($map, map-index($map, $key));
}

// Private function needed for `map-merge` and `map-remove`
// ---
// @private
// ---
// @param [list] $map: map to parse
// @param [literal] $key: key to find
// ---
// @return [number] | [null]
// ---
@function map-index($map, $key) {
  @if not is-valid-map($map) {
    @return throw();
  }
  
  @for $i from 1 through length($map) {
    @if key(nth($map, $i)) == $key {
      @return $i;
    }
  }
  
  @return null;
}

// Private function needed for `map-remove`
// ---
// @private
// ---
// @param [list] $list: list to update
// @param [number] $index: index to remove
// ---
// @return [list]
// ---
@function remove-nth($list, $index) {
  $new-list: comma-list();
  
  @for $i from 1 through length($list) {
    @if $i != $index {
      $new-list: append($new-list, nth($list, $i));
    }
  }
  
  @return $new-list;
}

// Dirty hack to have a comma separated list
// See: http://sassmeister.com/gist/a9e554b0e1a72a84fec7
// ---
// @private
// ---
// @param [argList] $args: args to convert to comma separated list
// ---
// @return [list]
// ---
@function comma-list() {
  @return zip(());
}

// Private function returning key from a tuple
// ---
// @private
// ---
// @param [list] $tuple: tuple
// ---
// @return [literal]
// ---
@function key($tuple) {
  @return nth($tuple, 1);
}

// Private function returning value from a tuple
// ---
// @private
// ---
// @param [list] $tuple: tuple
// ---
// @return [literal]
// ---
@function value($tuple) {
  @return nth($tuple, 2);
}

// Private function checking for tuple validity
// ---
// @private
// ---
// @param [list] $tuple: tuple
// ---
// @return [bool]
// ---
@function is-valid-tuple($tuple) {
  @return length($tuple) == 2;
}

// Private function checking for map validity
// ---
// @private
// ---
// @param [list] $map: map
// ---
// @return [bool]
// ---
@function is-valid-map($map) {
  @each $tuple in $map {
    @if not is-valid-tuple($tuple) {
      @return false;
    }
  }
  
  @return true;
}

// Private function checking for tuple validity
// ---
// @param [list] $tuple: tuple
// ---
// @return [bool]
// ---
@function throw($message: "Error: invalid map. Aborting!") {
  @warn $message;
  @return null;
}


// Sample map
$map: (
  "small" 767px,
  "medium" 992px,
  "large" 1200px
);

// Tests
test {
  inspect: $map;
  map-has-key: map-has-key($map, "small");
  map-has-key: map-has-key($map, "tiny");
  map-keys: map-keys($map);
  map-values: map-values($map);
  map-get: map-get($map, "small");
  map-get: map-get($map, "tiny");
  map-merge: map-merge($map, "huge" 1600px);
  map-merge: map-merge($map, ("small" 800px, "huge" 1600px));
  map-remove: map-remove($map, "small");
}

SassMeister-output.css

test {
  inspect: "small" 767px, "medium" 992px, "large" 1200px;
  map-has-key: true;
  map-has-key: false;
  map-keys: "small" "medium" "large";
  map-values: 767px 992px 1200px;
  map-get: 767px;
  map-merge: "small" 767px, "medium" 992px, "large" 1200px, "huge" 1600px;
  map-merge: "small" 800px, "medium" 992px, "large" 1200px, "huge" 1600px;
  map-remove: "medium" 992px, "large" 1200px;
}