在 Javascript 中将 char 转换为 String

Question

Read it, Before it gets marked as duplicate Sorry! I couldn't come up with a better description of the question

Anyways, I was making a simple program which reverses the given word (eg 'word' to 'drow'). I was trying to convert the String into char array first and then printing each character backwards in the console using for loop. However, I need to save the value in a String now that I can't seem to figure out. This is the code here:

 var answer = document.getElementById("ta").value;
 var arr = answer.split("");
      for(i=arr.length-1;i>=0;i--) { //minus 1 because index starts at 0
           str = arr[i];
           console.log(str); //it works but displays each character individually
           }

I just want all the characters in a String. Please help! Brevity in the answer would be appreciated

Answer 1

If you want to put all the characters in str you can try this way:

str= str+arr[i]

or try this way:

var str = "";
arr.forEach(element => {str= str+element});
 console.log(str)

Answer 2

JavaScript unlike other oops, provide an inherited reverse function that reverses array . So one answer to this whould be:

let arr = answer.split("") //note this creates an array with each char as element of array
arr = arr.reverse(); //this reverses the array
let string = arr.join(""); //this joins the array into a single string

Another method would be the one you are trying to do, create your own reverse function. You are doing it all right but just missing a step, that is to join the array, you are simply printing each letter of the array and thats the property of console.log that each console.log prints to a new line. That explains why you are getting it all in new line.

var answer = document.getElementById("ta").value;
 var arr = answer.split("");
var str ="";
      for(i=arr.length-1;i>=0;i--) { //minus 1 because index starts at 0
           str =str +  arr[i];
           }
console.log(str); //it should be outside the loop and print string once it has been formed

PS:I have given as much detail I can on this to get you started but this is a very basic question and doesnt deserve to be here, you should follow some basic concepts of js on mdn or w3schools. Plus google your problems before turning to stackoverflow.