Last Updated : 29 Aug, 2024
The concat() method in JavaScript join or concatenate two or more strings together. It does not change the existing strings and returns a new string. This method efficiently combines multiple strings into one, ensuring the original strings remain unchanged.
Syntaxstr1.concat(str2, str3, str4,......, strN)Parameters
Note: If the parameters are not of String type, then first it converted to string before concatenating the strings.
Return valueReturns a new string that is the combination of all the different strings passed to it as the argument.
Example 1: Join Two Strings with concat() MethodThe string "str" is initialized with the value "Welcome". Then concat() method is used on str to combine it with "Geeks".
JavaScript
// JavaScript String concat() method
// to merge strings together
// First string
let str = "Welcome";
// Joining the strings together
let concatStr = str.concat(" Geeks");
console.log(concatStr);
Example 2: Concatenating Multiple Strings with concat() Method
The concatenates strings str1, str2, and str3 together. The result1 combines them without spaces, while result2 concatenates them with spaces.
let str1 = 'Geeks'
let str2 = 'For'
let str3 = 'Geeks'
// Concating all the strings together without spaces
let result1 = str1.concat(str2, str3)
console.log('Result without spaces: ' + result1)
// Concating all the strings together with spaces
let result2 = str1.concat(' ', str2, ' ', str3)
console.log('Result with spaces: ' + result2)
Result without spaces: GeeksForGeeks Result with spaces: Geeks For GeeksEample 3: Concatenate with Empty Strings
You can use the concat() method with empty strings to control the formatting or add spaces dynamically
JavaScript
const str1 = "Hello";
const str2 = "";
const str = str1.concat(str2);
console.log(str);
We have a complete list of Javascript string methods, to check those please go through this Javascript String Complete reference article.
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