join an array of substrings into a string in javascript

To join an array of substrings into a string in javascript, you can use the .join() method.

Here's an example:

index.tsx
const substrings = ["hello", "world", "!"];
const sentence = substrings.join(" "); // join the substrings with a space between them
console.log(sentence); // "hello world!"
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In this example, we first define an array called substrings which contains three strings. We then use the .join() method to join the substrings into a single string, with a space character between each substring. Finally, we log the resulting sentence to the console.

The first parameter of the .join() method is the separator that you want to use to join the substrings. In this example, we used a space character " ", but you can use any string or character that you'd like. If you omit this parameter, the substrings will be joined together without any separator.