The Array.prototype.join() method:
var arr = ["Zero", "One", "Two"];
document.write(arr.join(", "));The Array.prototype.join() method:
var arr = ["Zero", "One", "Two"];
document.write(arr.join(", "));Actually, the toString() implementation does a join with commas by default:
var arr = [ 42, 55 ];
var str1 = arr.toString(); // Gives you "42,55"
var str2 = String(arr); // Ditto
I don't know if this is mandated by the JS spec but this is what most pretty much all browsers seem to be doing.
How do I convert an array to a string with commas in JavaScript
How to convert array into comma separated string in javascript - Stack Overflow
javascript - How to convert object array to comma separated string? - Stack Overflow
javascript - Create comma-delimited string - Stack Overflow
You can use this one-liner in modern browsers
Object.keys(person).map(function(k){return person[k]}).join(",");
This code will be useful when you want to extract some property values from an array of objects as comma separated string.
var arrayObjects = [
{
property1: "A",
property2: "1"
},
{
property1: "B",
property2: "2"
},
{
property1: "C",
property2: "3"
}
];
Array.prototype.map.call(arrayObjects, function(item) { return item.property1; }).join(",");
Output - "A,B,C"
In JavaScript, you can convert an array to a string with commas using the join()
method.
The join() method returns a string that concatenates all the elements of an array, separated by the specified separator, which in this case is a comma.
Here is an example:
const array = ['apple', 'banana', 'orange'];
const string = array.join(', ');
console.log(string);
// output: "apple, banana, orange"
In this example, we first define an array of three fruits. Then we use the join()
method with a comma and a space as the separator to create a string that lists all the fruits with a comma and a space between each one.
You can replace the comma and space separator with any other separator you like, such as a hyphen, a semicolon, or a newline character.
It's important to note that the join() method only works on arrays, and it will throw an error if you try to use it on any other type of object.
Click here to learn more ways to Convert Array to String with Commas in JS
The method array.toString() actually calls array.join() which result in a string concatenated by commas. ref
var array = ['a','b','c','d','e','f'];
document.write(array.toString()); // "a,b,c,d,e,f"Also, you can implicitly call Array.toString() by making javascript coerce the Array to an string, like:
//will implicitly call array.toString()
str = ""+array;
str = `${array}`;
Array.prototype.join()
The join() method joins all elements of an array into a string.
Arguments:
It accepts a separator as argument, but the default is already a comma ,
str = arr.join([separator = ','])
Examples:
var array = ['A', 'B', 'C'];
var myVar1 = array.join(); // 'A,B,C'
var myVar2 = array.join(', '); // 'A, B, C'
var myVar3 = array.join(' + '); // 'A + B + C'
var myVar4 = array.join(''); // 'ABC'
Note:
If any element of the array is undefined or null , it is treated as an empty string.
Browser support:
It is available pretty much everywhere today, since IE 5.5 (1999~2000).
References
- ECMA Specification
- Mozilla
- MSDN
Use the join method from the Array type.
a.value = [a, b, c, d, e, f];
var stringValueYouWant = a.join();
The join method will return a string that is the concatenation of all the array elements. It will use the first parameter you pass as a separator - if you don't use one, it will use the default separator, which is the comma.
You can use join
let arr = ["Varberg","Halmstad","Falkenberg"]
console.log(arr.join(','))Use Array.prototype.join to to convert it into a comma separated string.
let str = ort=["Varberg","Halmstad","Falkenberg"].join(","); //"," not needed in join
console.log(str);A simple toString also works in this case.
let str = ort=["Varberg","Halmstad","Falkenberg"].toString();
console.log(str);Array.prototype.join() is what you're looking for:
arr.join(',');
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/join
var arr = ['Hi', 'I', 'am', 'a', 'comma', 'separated', 'list'];
arr.join(','); // === "Hi,I,am,a,comma,separated,list"
Use the join method:
arr.join(',');