make a function variable

make a function variable

```  
answer() {
      const answer = this.text.answer
      const splitedAnswer = answer.split(';')
      if (splitedAnswer.length > 1) {
        const createNode = (x) => '<li>' + x + '</li>'
        const list = splitedAnswer.map(createNode)
        return '<ul>' + list.join('') + '</ul>'
      }
      return answer
    }
```