Reverse a word, sentence or reverse each words in a sentence.

reverseStr.js

// @param str: string without space
function reverseStr(str){
  return str.split('').reverse().join('');
}

// @param sentence: pass a sentence.
function reverseEachWordInSentence(sentence){
  return sentence.split(' ').map(reverseStr).join(' ');
}

// @param sentence: pass a sentence.
function reverseSentence(s){
  return s.split(' ').reverse().join(' ');
}