Likou brush question day6 (replace spaces + left-rotate characters)

replace spaces

topic

the code

var replaceSpace = function(s) {
    
    
     return s.replace(/ /g, "%20");
};
var replaceSpace = function(s) {
    
    
    return s.split(' ').join('%20');
};

left rotate string

topic

train of thought

• First repeat the string once, splicing at the end
• calculaten = k % len
• Then nintercept from the double string, lenjust intercept

the code

var reverseLeftWords = function(s, n) {
    
    
    let len=s.length;
    let num=n%len;
    let str=`${
      
      s}${
      
      s}`
    return str.slice(num,num+len)
};