code: function capitalize (str) {
    if (R.isNil(str)) {
      throw new Error('The "capitalize" helper requires one argument.')
    }
  
    if (!R.is(String, str)) {
      str = str.toString();
    }
  
    return Capitalize(str);
  }
docs: Capitalize the first letter of a String.
  
  @since 0.4.0
  @param {String|*} str - String to capitalize. Other types will be converted.
  @return {String}
  @example:
  {{capitalize "hello world"}} //=> "Hello world"