[leetCode] 151. Reverse Words in a String - Javascript

문제

Given an input string s, reverse the order of the words.

A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.

Return a string of the words in reverse order concatenated by a single space.

Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.

 

Example 1:

Input: s = "the sky is blue"
Output: "blue is sky the"

Example 2:

Input: s = "  hello world  "
Output: "world hello"
Explanation: Your reversed string should not contain leading or trailing spaces.

Example 3:

Input: s = "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.

 

 

 

접근방법

Initially, I transformed the given string parameter into an array and reversed the array using reverse() method.

After checking all of obects in array using a loop, i removed empty objects. 
Then, I transformed the array back into a string. considering only the none-empty elements.

 

 

 

 

 

코드 

var reverseWords = function(s) {
    let wordArr = []
    s = s.split(' ').reverse()
    s.forEach((w) => {
        if(w != ''){
            wordArr.push(w)
        }
    })
    
    return wordArr.join(" ")

};