/// Maps

/// Given a list of key-value pairs, get the value based on the key.
/// @parameter {List} $list-map  a list of 2-item lists i.e. key-value pairs, e.g. foo 2, bar 3
/// @parameter {String} $key  value corresponding to the 1st item in a pair
/// @parameter {String} $attribute  value corresponding to the 1st item in a nested key-value pair
/// @return {String} value corresponding to the 2nd item in the pair with matching key, or null if key not found.

@function get-value($list, $key, $attribute:null) {
    @each $pair in $list {
        @if nth($pair, 1) == $key {
            @if $attribute != null {
                @each $item in nth($pair, 2) {
                    @if nth($item, 1) == $attribute {
                        @return nth($item, 2);
                    }
                }
            } @else {
                @return nth($pair, 2);
            }
        }
    }
    @return null;
}