JavaScript (ES2026) reference · String Methods

JavaScript String concat() Method

Join one or more strings to the end of this string and return the result. The + operator and template literals are more common.

JavaScript (ES2026) Since ES3

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Syntax

string.concat(str1, str2, /* …, */ strN)

Parameter	Description
`strings`	Values to append (converted to strings).

A new string.

Join stringsTry it yourself

console.log("Ready".concat("Camel", ".com"));

Output

ReadyCamel.com

The usual alternativesTry it yourself

const first = "Ada", last = "Lovelace";
console.log(first + " " + last);
console.log(`${first} ${last}`);

Output

Ada Lovelace
Ada Lovelace

Version	Change
JavaScript ES3	Added

string.padEnd() · Pad the end of a string with another string until it reaches a target length. Useful for aligned text columns.
string.repeat() · Return a new string made of this string repeated a given number of times, for example to build separators or padding.
array.join() · Join all elements into one string, separated by commas or by a separator you choose.
JavaScript Strings · tutorial
JavaScript String Methods · tutorial