题解 | #字符串加解密#
字符串加解密
https://www.nowcoder.com/practice/2aa32b378a024755a3f251e75cbf233a
占用内存拉满，运行速度还行
function fn(str, isAdd = true) {
const arr = str.split('')
for(let i in arr) {
const ascii = arr[i].charCodeAt()
const val = isAdd ? 1 : -1
const index = isAdd ? 0 : 2
const a = [
['z','A','a','Z'],['Z','a','A','z'],['9','0','0','9']
]
if(/[a-z]/.test(arr[i])) {
arr[i] = arr[i] !== a[0][index] ? String.fromCharCode(ascii - 32 + val) : a[0][index+1]
} else if(/[A-Z]/.test(arr[i])) {
arr[i] = arr[i] !== a[1][index] ? String.fromCharCode(ascii + 32 + val) : a[1][index+1]
} else if(/[0-9]/.test(arr[i])) {
arr[i] = arr[i] !== a[2][index] ? String.fromCharCode(ascii + val) : a[2][index+1]
}
}
return arr.join('')
}
console.log(fn(readline()))
console.log(fn(readline(), false))
