Add characters to a string in Javascript - Stack Overflow

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I need to add in a For Loop characters to an empty string. I know that you can use the function concat in Javascript to do concats with strings

var first_name = "peter"; 
var last_name = "jones"; 
var name=first_name.concat(last_name) 

But it doesn't work with my example. Any idea of how to do it in another way?

My code :

var text ="";
for (var member in list) {
  text.concat(list[member]);
}

I need to add in a For Loop characters to an empty string. I know that you can use the function concat in Javascript to do concats with strings

var first_name = "peter"; 
var last_name = "jones"; 
var name=first_name.concat(last_name) 

But it doesn't work with my example. Any idea of how to do it in another way?

My code :

var text ="";
for (var member in list) {
  text.concat(list[member]);
}

• javascript
• string
• for-loop

Share Improve this question Follow edited Sep 28, 2021 at 5:09 Super Kai - Kazuya Ito 1 asked Apr 22, 2011 at 10:55 BrunoBruno 9,0071313 gold badges3939 silver badges5555 bronze badges 1

• 2 If list is an array, then don't use for...in but a normal for loop. More information here: developer.mozilla.org/en/JavaScript/Reference/Statements/… Btw. if you look closely at both of your examples, you can see the difference ( name=first_name.concat(last_name) vs text.concat(list[member]) – Felix Kling Commented Apr 22, 2011 at 11:16

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9 Answers 9

Sorted by: Reset to default 197

let text = "";
for(let member in list) {
  text += list[member];
}

You can also keep adding strings to an existing string like so:

var myString = "Hello ";
myString += "World";
myString += "!";

the result would be -> Hello World!

simply used the + operator. Javascript concats strings with +

It sounds like you want to use join, e.g.:

var text = list.join();

To use String.concat, you need to replace your existing text, since the function does not act by reference.

let text = "";
for (const member in list) {
  text = text.concat(list[member]);
}

Of course, the join() or += suggestions offered by others will work fine as well.

Simple use text = text + string2

Try this. It adds the same char multiple times to a string

const addCharsToString = (string, char, howManyTimes) => {
  string + new Array(howManyTimes).fill(char).join('')
} 

You can also use string interpolation

let text = "";
for(let member in list) {
  text = `${text}${list[member]}`;
}

your array of strings (list) could work with map and join; (Also possible to additionally change strings if you want)

var text = list.map(i => `${i}`).join(' ') 

would return First Name

but if you want to add more things around the name, above template also helps:

var text = list.map(i => `'${i}'`).join(' ') 

would return 'First' 'Name'

and in case you would want to have a sequence of names, separeted by comma

var text = list.map(i => `'${i}'`).join(',') 

would return 'First','Name','Second','Third',...

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