151. Reverse Words in a String（js）

151. Reverse Words in a String

Given an input string, reverse the string word by word.

 

Example 1:

Input: "the sky is blue"
Output: "blue is sky the"
Example 2:

Input: "  hello world!  "
Output: "world! hello"
Explanation: Your reversed string should not contain leading or trailing spaces.
Example 3:

Input: "a good   example"
Output: "example good a"
Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.
 

Note:

A word is defined as a sequence of non-space characters.
Input string may contain leading or trailing spaces. However, your reversed string should not contain leading or trailing spaces.
You need to reduce multiple spaces between two words to a single space in the reversed string.

Meaning of the questions: Given a sentence, the sentence reversed words, trailing spaces removed, spaces between words to maintain a space

code show as below:

/ * * 
 * @Param {String} S 
 * @return {String} 
 * / 
var reverseWords = function (S) {
 //      by cutting string space 
    the let Sarr = s.split ( '' ); 
    the let ARR = [];
     for (the let I = 0; I <sarr.length; I ++ ) {
 //          empty string entry screen out all 
        IF (Sarr [I] == ''! ) { 
            arr.unshift (Sarr [I]); 
        } 
    } 
//      by spaces merge array entries 
    return arr.join ( '' ); 
};