如何在Javascript中的for循环之间放置空格

Question

I am wondering how to put a space in between each array item when printing to the console. I have tried messing with the countries[i] but I usually get an error in the console.

 var countries = ["France", "Germany", "Austria"] var i var s = "" for (i = 0; i < countries.length; i++) { s += countries[i] } console.log(s)

Answer 1

Using .join() :

 var countries = ["France", "Germany", "Austria"]; var spaced = countries.join(' '); console.log(spaced);

Answer 2

you can use join :

Ex: countries.join(' ');

or concat a space on the end:

s += countries[i] + ' '

Answer 3

So you want following as the end result?

France Germany Austria

There is a function in JavaScript to concatenate all elements of an array into a new string:

join()

More info on this function: Array.prototype.join()

By default the ',' is the separator but you can also specify one, such as a space. So this is the way to do it:

 var countries = ["France", "Germany", "Austria"]; var countryString = countries.join(' '); console.log(countryString);

Answer 4

Here is one approach:

let a = ["France", "Germany", "Austria"];
let s = '';
for (let s2 of a) {
   if (s != '') {
      s += ' ';
   }
   s += s2;
}
console.log(s);

or you could just Join:

let s = a.join(' ');

Answer 5

Simply use Spread Operator during console logging. In your case use,

console.log(...countries);

Answer 6

You essentially just need to concat a space character to the end of each string you are adding

var countries = ["France", "Germany", "Austria"]
var i
var s = ""

for (i = 0; i < countries.length; i++) {
  s += countries[i] + " "
}

console.log(s)

Answer 7

You could do it in a better way as follows using the join() method provided by JavaScript -

 var countries = ["France", "Germany", "Austria"] // Alternative better way - var s = countries.join(' ') console.log(s) // Your method is unnecessarily long but can be done as - /* var i; var s = "" for(i = 0; i < countries.length; i++) { s += countries[i]; if(i !== countries.length -1) s+= " "; } */

As a side tip, whenever you use JavaScript, try to see if you can use the built-in methods provided in JS. Most of the situation could be handled using an inbuilt method and you would never need to use an explicit for loop for most of the time.