Sass version of PHP Implode

Sass version of PHP Implode

//
// Returns string after joining list elements with a glue string.
// Similar to PHP's implode function
//
@function implode($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