链接：字符串加密 Encrypt this!
Rules:
- The first letter needs to be converted to its ASCII code.
- The second letter needs to be switched with the last letter
Examples:
encryptThis(“Hello”) === “72olle”
encryptThis(“good”) === “103doo”
encryptThis(“hello world”) === “104olle 119drlo”
加密字符串：字符串的第一个字母转为ASCII码，第二个字母与最后一个字母交换。
解法1：利用Array.prototype.slice截取字符串的字符。
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| var encryptThis = function(text) {
let arr = text.split(' ').map(function(item){
if(item.length==1){
return item.charCodeAt(0)
}
else if(item.length==2){
return item.charCodeAt(0)+item.slice(1)
}
else if(item.length>=3){
return item.charCodeAt(0)+item.slice(-1)+item.slice(2,-1)+item[1]
}
})
return arr.join(" ")
}
|
解法2：利用正则表达式。
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| const encryptThis = text => text
.split(' ')
.map(word => word
.replace(/(^\w)(\w)(\w*)(\w$)/, `$1$4$3$2`)
.replace(/^\w/, word.charCodeAt(0))
)
.join(' ');
|
