code: function concat () {
    var items = R.dropLast(1, arguments);
  
    if (!items.length) {
      throw new Error('The helper "concat" must be passed at least one argument.');
    }
  
    return items.join('');
  }
docs: Concatenate items into a single string.
  
  @since v0.8.0
  @param {...*} items
  @return string
  @example
  {{concat "foo" "bar"}} //=> "foobar"