Web Front-end
JS Tutorial
How to create a string by concatenating elements of an array in JavaScript?
How to create a string by concatenating elements of an array in JavaScript?
In this tutorial, we will learn how to create a string by concatenating the elements of an array in JavaScript. We will see two different ways to accomplish this task. The first method is to use the simple addition operator ( ) to add array elements and separators. The second method is to use the join() method.
Method 1: Use the addition operator ( )
In this method we will pass two parameters to the function which is the array of elements that we have to join and the second parameter will be the delimiter that the user has to give, basically the delimiter is a The middle element that will be used when concatenating strings can be a space, comma, or any word between each element of the array value.
algorithm
Step 1 - Create an array named arr containing the elements. Use the innerHTML attribute to display the array.
STEP 2 - Create a variable named ans to store the resulting string. Initialize the array using its first element.
Step 3 - Define the delimiter. We define it as a variable with spaces.
Step 4 - Loop through the array elements starting from index value 1 since we have initialized the 0th element to a stringans.Use the " " operator to add array elements to the string ans.
Step 5 - Finally display the final string using the innerHTML attribute.
The pseudocode of the above algorithm looks like this -
var arr=["first", "second", "third", "fourth", "fifth"];
var ans=arr[0];
var separate = " ";
for(var i=1;i<arr.length;i++){
ans+=separate+arr[i];
}
document.getElementById('writeHere').innerHTML=ans
We have an array with certain values and the individual variables will take delimiters as input from the user.
We checked if the user did not enter any delimiter, then by default we will give the delimiter as a space.
Example
We took the ans variable with the 0th array element, since the first element won't have any delimiter, and then used the one starting from the first index Loop i.e. 2<数组的sup>nd values we start iterating and concatenating all the array elements in parallel into the ans variable. Let's embed the function code into HTML.
<html>
<body>
<p>arr=["Tutorials", "Point", "Simply", "Easy", "Learning"]</p>
<input type="text" placeholder="Seperator" id="separate" />
<input type="button" value="Join" onclick="joinTheArr()" id="JoinBtn"/>
<p id="writeHere">After joning array is:..</p>
<script>
function joinTheArr(){
var arr=["Tutorials", "Point", "Simply", "Easy", "Learning"];
var separate=document.getElementById("separate").value
if(!separate)separate=" "
console.log(separate)
var ans=arr[0];
for(var i=1;i<arr.length;i++){
ans+=separate+arr[i];
}
document.getElementById('writeHere').innerHTML=ans
}
</script>
</body>
</html>
Method 2: Use join() method
join() method converts each element of the array into a string and then concatenates all the strings using a delimiter that the user must define and it will appear between each array element Already converted to a string, after all it will return an array in the form of a string. join() Does not modify the original array.
Example
In the following example, we use the join() method to join the array elements with the delimiter.
<!DOCTYPE html>
<html>
<body>
<p>arr=["first", "second", "third", "fourth", "fifth"]</p>
<input type="text" placeholder="Seperator" id="separate" />
<input type="button" value="Join" onclick="joinTheArr()" id="JoinBtn"/>
<p id="writeHere">After joning array is:<br><br></p>
<script>
function joinTheArr(){
var arr=["first", "second", "third", "fourth", "fifth"];
var separate=document.getElementById("separate").value
if(!separate)
separate=" ";
arr=arr.join(separate);
document.getElementById('writeHere').innerHTML+=arr
}
</script>
</body>
</html>
The idea here is that we use join arr.join(separate) and assign it back to the array, since join returns the array as a string.
So this is how we create a string by concatenating array elements.
The above is the detailed content of How to create a string by concatenating elements of an array in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1385
52
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
TypeScript for Beginners, Part 2: Basic Data Types
Mar 19, 2025 am 09:10 AM
Once you have mastered the entry-level TypeScript tutorial, you should be able to write your own code in an IDE that supports TypeScript and compile it into JavaScript. This tutorial will dive into various data types in TypeScript. JavaScript has seven data types: Null, Undefined, Boolean, Number, String, Symbol (introduced by ES6) and Object. TypeScript defines more types on this basis, and this tutorial will cover all of them in detail. Null data type Like JavaScript, null in TypeScript
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
Can PowerPoint run JavaScript?
Apr 01, 2025 pm 05:17 PM
JavaScript can be run in PowerPoint, and can be implemented by calling external JavaScript files or embedding HTML files through VBA. 1. To use VBA to call JavaScript files, you need to enable macros and have VBA programming knowledge. 2. Embed HTML files containing JavaScript, which are simple and easy to use but are subject to security restrictions. Advantages include extended functions and flexibility, while disadvantages involve security, compatibility and complexity. In practice, attention should be paid to security, compatibility, performance and user experience.
