How to combine arrays and strings using the concat method in JavaScript

The concat method is used to combine two or more arrays to create a new array. In this article, we will take a look at the specific usage of the concat method in How to combine arrays and strings using the concat method in JavaScript.

Combining arrays using the concat method

Combining two arrays

Here we introduce how to use the concat method to combine two arrays.

Let’s look at the following example

var array1 = ['ha', 'la'];
var array2 = ['re', 'he'];
var result = array1.concat(array2);
console.log(result);

The execution result is as follows

ha,la,re,he

Through the above method, we can combine two arrays together

Combination Three arrays

The code is as follows

var array1 = ['ha', 'la'];
var array2 = ['re', 'he'];
var array3 = ['jo', 'ko'];
var result = array1.concat(array2, array3);
console.log(result);

The execution result is as follows

ha,la,re,he,jo,ko

Through the above method, we can combine the three arrays together.

Use the concat method to combine strings

The concat method can also combine strings together. The basic usage is the same as combining arrays

Let’s look at a specific example

The code is as follows

var str1 = 'php';
var str2 = '中文网';
var result = str1.concat(str2);
console.log(result);

The execution result is as follows

php中文网

In the above example, you can see that two strings are combined together and output is a string.

When combining large numbers of strings, execution performance (speed) must also be considered.

In fact, the fastest and easiest way to implement string combination is to use " ".

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