数组的一些基本函数

求数组里的奇数和

let scores = [95,91,59,55,42,82,72,85,67,66,55,91]
let sum = scores.reduce((sum, item)=>{
  return item%2===0?sum+0:sum+item
},0)
console.log(sum) // 奇数之和：598

把数字变成星期

let arr = [0,1,2,2,3,3,3,4,4,4,4,6]
let arr2 = arr.map((i)=>{
  const hash = {0:'周日',1:'周一',2:'周二',3:'周三',4:'周四',5:'周五',6:'周六'}
  return hash[i]
})

找出所有大于 60 分的成绩

let scores = [95,91,59,55,42,82,72,85,67,66,55,91]
let scores2 = scores.filter(n => n>= 60)
console.log(scores2) //  [95,91,82,72,85,67,66, 91]