how to perform concatenation on a variable in JavaScript

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Matthew “matwal” Walton answered on April 6, 2020 Popularity 3/10 Helpfulness 1/10

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how to perform concatenation on a variable in JavaScript

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let x = "Java";
let y = "Script";
let z = x + y;//"Java" + "Script"
console.log(z);

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Tags: concatenation javascript

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Contributed on Oct 06 2024

Matthew “matwal” Walton

0 Answers Avg Quality 2/10

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how to concatenate strings and variables in javascript

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const helloName = name => `Hello ${name}!`

Popularity 10/10 Helpfulness 4/10 Language javascript

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Contributed on Apr 06 2020

TechWhizKid

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javascript concatenation syntax

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var str = 'Hello' + ' ' + 'world!'; // str = 'Hello world!'
// a comma ',' is the default delimiter for array.join 
var str = ['Hello',' ','world!'].join();   // str = 'Hello, ,world!'
var str = ['Hello',' ','world!'].join(''); // str = 'Hello world!'

var str1 = 'Hello';
var str2 = str1.concat(' ','world!');  // str1 = 'Hello', str2 = 'Hello world!"

var str1 = 'Hello';                    
var str2 = `${str1} world!`;           // str1 = 'Hello', str2 = 'Hello world!"
                                       // note backticks `

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Contributed on Aug 02 2023

YEGdad

0 Answers Avg Quality 2/10

javascript concatenation

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// the fastest way to string concat in cycle when number of string is less than 1e6
// see https://medium.com/@devchache/the-performance-of-javascript-string-concat-e52466ca2b3a
// see https://www.javaer101.com/en/article/2631962.html
function concat(arr) {
    let str = '';
    for (let i = 0; i < arr.length; i++) {
        str += arr[i];
    }

    return str;
}

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Contributed on Apr 21 2021

Plain Petrel

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string javascript concatenation

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    var dest = new String("");
    var src = new String("aze");
    var ar = new Array();
    ...
    ar.push(src);
    ar.push(src);
    ...
    dest = ar.join("");

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Source: b-le-roux.developpez.com

Tags: concatenation co

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Contributed on Sep 28 2020

Breakable Barracuda

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Doing stress test on EC2 server

Comment

-------------------------------------------------------------------------------------------------------------
Autoscaling - Generating Load
-------------------------------------------------------------------------------------------------------------

sudo amazon-linux-extras install epel

sudo yum -y install stress

uptime

sudo stress --cpu 8 -v --timeout 10000s

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Contributed on Oct 06 2024

Mayowa Fajube

0 Answers Avg Quality 2/10

string javascript concatenation

Comment

    var dest = new String("");
    var src = new String("aze");
    ...
    dest += src + src + src + src + src;

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Source: b-le-roux.developpez.com

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Contributed on Sep 28 2020

Breakable Barracuda

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what concatenation in javascript

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/*
Note:

Concatenation in javascript
Concat() The concat() method is used to merge two or more arrays. 
This method does not change the existing arrays but instead returns a new array.
Concatenation is when you add string to an integer then the integer becomes a string.
*/


//CODE//

var myAge = 100;
console.log("My age is" + myAge);
myAge = 29;
console.log("My age next year will be" + myAge);

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Contributed on Aug 23 2022

Blessing Obajinmi

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how to perform concatenation on a variable in JavaScript

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