JavaScript Program to Join an Array of Words into a String

📘 Premium Read: Access my best content on Medium member-only articles — deep dives into Java, Spring Boot, Microservices, backend architecture, interview preparation, career advice, and industry-standard best practices.

🎓 Top 15 Udemy Courses (80-90% Discount): My Udemy Courses - Ramesh Fadatare — All my Udemy courses are real-time and project oriented courses.

▶️ Subscribe to My YouTube Channel (176K+ subscribers): Java Guides on YouTube

▶️ For AI, ChatGPT, Web, Tech, and Generative AI, subscribe to another channel: Ramesh Fadatare on YouTube

Introduction

In JavaScript, you can easily join an array of words into a single string using the join() method. This method concatenates all the elements of an array into a string, separated by a specified delimiter (such as a space or comma). Joining arrays is a common task, especially when dealing with sentences or phrases.

Problem Statement

Create a JavaScript program that:

• Accepts an array of words.
• Joins the array elements into a single string, separated by spaces.
• Returns and displays the resulting string.

Example:

• Input: ["Hello", "world", "this", "is", "JavaScript"]

• Output: "Hello world this is JavaScript"

• Input: ["JavaScript", "is", "fun"]

• Output: "JavaScript is fun"

Solution Steps

1. Read the Input Array: Provide an array of words either as user input or directly in the code.
2. Join the Array: Use the join() method to concatenate the array elements, separated by a space.
3. Display the Result: Print the resulting string.

JavaScript Program

// JavaScript Program to Join an Array of Words into a String // Author: https://www.javaguides.net/ function joinArrayIntoString(arr) { // Step 1: Join the array into a string with space as a separator let result = arr.join(' '); // Step 2: Return the resulting string return result; } // Example input let wordsArray = ["Hello", "world", "this", "is", "JavaScript"]; let resultString = joinArrayIntoString(wordsArray); console.log(`The joined string is: "${resultString}"`); 

Output

The joined string is: "Hello world this is JavaScript" 

Example with Different Input

let wordsArray = ["JavaScript", "is", "fun"]; let resultString = joinArrayIntoString(wordsArray); console.log(`The joined string is: "${resultString}"`); 

Output:

The joined string is: "JavaScript is fun" 

Explanation

Step 1: Join the Array

• The join() method concatenates all the elements of the array into a single string, with each word separated by a space (' '). You can customize the delimiter if needed (e.g., comma, hyphen).

Step 2: Return and Display the Result

• The resulting string is returned by the function and printed using console.log().

Conclusion

This JavaScript program demonstrates how to join an array of words into a single string using the join() method. This approach is efficient and easy to use, allowing you to combine elements of an array into a readable string for various use cases such as constructing sentences, formatting output, or generating text dynamically.