Add: SASS - utils/list

__tests__/list.test.scss

@@ -0,0 +1,31 @@
+@use 'true' as *;
+@use "../src/utils/list";
+
+// TODO: Need more tests..
+$simpleList: (ab cd efgh ijk);
+$dupList: (ab cd efgh efgh efgh ijk);
+
+@include test-module("Remove at list [fn]") {
+  @include test("simple") {
+    @include assert-equal(
+      list.remove($simpleList, "cd"),
+      (ab efgh ijk)
+    );
+  }
+
+  @include test("duplicate") {
+    @include assert-equal(
+      list.remove($dupList, "efgh"),
+      (ab cd ijk)
+    );
+  }
+}
+
+@include test-module("Convert to str [fn]") {
+  @include test("simple") {
+    @include assert-equal(
+      list.to-string($simpleList),
+      (((null ab) cd) efgh) ijk
+    );
+  }
+}

src/utils/_list.scss

@@ -0,0 +1,36 @@
+// https://kittygiraudel.com/2013/08/08/advanced-sass-list-functions/
+// https://gist.github.com/Jakobud/ec056b52f3673cc369dc97f2c2428424
+
+@function remove($list, $value, $recursive: false) {
+  $result: ();
+
+  @for $i from 1 through length($list) {
+    @if type-of(nth($list, $i)) == list and $recursive {
+      $result: append($result, remove(nth($list, $i), $value, $recursive));
+    } @else if nth($list, $i) != $value {
+      $result: append($result, nth($list, $i));
+    }
+  }
+
+  @return $result;
+}
+
+@function to-string($list, $glue: '', $is-nested: false) {
+  $result: null;
+
+  @for $i from 1 through length($list) {
+    $e: nth($list, $i);
+
+    @if type-of($e) == list {
+      $result: $result#{to-string($e, $glue, true)};
+    } @else {
+      $result: if(
+        $i != length($list) or $is-nested,
+        $result#{$e}#{$glue},
+        $result#{$e}
+      );
+    }
+  }
+
+  @return $result;
+}