使用if语句声明const的值

Question

我有一个const numberOfComments是数组的大小，const riskByComments如果numberOfComments要大于2，我想拥有另一个值为5的值，否则应为0。

我知道我可以使用轻松地做到这一点let，但是我知道最好只使用const

    export const calculateRisk = (ticket) => dispatch => {
      const numberOfComments = ticket.comments.length
      let riskByComments//if i use const i need to declare its value
         //right away, i cannot use an if statement to do it later
      if(ticket.comments.length>2){
        riskByComments=5//if i use const inside the if statement
      }else{
         riskByComments=0//i cannot use it in the rest of my function
       }

Answer 1

使用条件运算符：

const riskByComments = numberOfComments >2 ? 5 : 0;