how the concat function works javascript

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DCmax1k answered on April 7, 2020 Popularity 10/10 Helpfulness 3/10

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how the concat function works javascript

Comment

var arr = [1, 2, 3, 4];
var arr2 = [5, 6, 7, 8];

const both = arr.concat(arr2);

console.log(both);
//[1, 2, 3, 4, 5, 6, 7, 8]

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Contributed on Apr 07 2020

DCmax1k

0 Answers Avg Quality 2/10

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string concat javascript

Comment

//This method adds two or more strings and returns a new single string.

let str1 = new String( "This is string one" ); 
let str2 = new String( "This is string two" ); 
let str3 = str1.concat(str2.toString());
console.log("str1 + str2 : "+str3)

output:
str1 + str2 : This is string oneThis is string two

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Source: developer.mozilla.org

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Contributed on Nov 23 2020

Creepy Gábor

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javascript concat

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const num1 = [2, 4, 5, 3, 8, 9, 11, 33, 44];
const num2 = [22, 33, 44, 55, 66, 77, 88];

const concatNumbers = num1.concat(num2)
console.log(concatNumbers)
//Expected output:
/*[
2, 4, 5, 3, 8, 9,
    11, 33, 44, 22, 33, 44,
    55, 66, 77, 88
 ]
*/

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Contributed on Sep 17 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

js concat

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let a = "foo";
let b = ["f", "o", "o"];

let c = a.concat("bar");           // "foobar"
let d = b.concat(["b", "a", "r"]); // ["f","o","o","b","a","r"]

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Source: dev.to

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Contributed on Jul 17 2022

Envious Emu

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javascript concat

Comment

const array1 = [1, 2, 3, 4, 5];
const array2 = [6, 7, 8, 9, 10];
const array3 = [11, 12, 13, 14, 15];

const mergeArray = array1.concat(array2, array3);

console.log(mergeArray);

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Source: dev.to

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Contributed on Oct 07 2022

Azizul7m

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how to concatenate in javscript

Comment

var one = 'Hello';
var two = 'World';

console.log(one + two);
It will print: HelloWorld

console.log(one + ' ' + two);
It will print: Hello World

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Contributed on Jul 26 2021

Annoying Alpaca

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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

0 Answers Avg Quality 2/10

string concat in js

Comment

let string1 = "Hello"
let string2 = "World"

let finalString = string1 + ", " + string2 + "!" // Hello, World!

Popularity 10/10 Helpfulness 1/10 Language javascript

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Contributed on Nov 21 2020

Nervous Narwhal

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how the concat function works javascript

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