join an array of substrings into a string in typescript

In TypeScript or JavaScript, you can use the join() method to join an array of substrings into a single string. The join() method takes an optional separator string that separates each element of the array. If the separator string is not provided, a comma is used by default.

Here's an example of how to use the join() method:

index.ts
const substrings: string[] = ["apple", "banana", "cherry"];
const joinedString: string = substrings.join(", ");

console.log(joinedString); // Output: "apple, banana, cherry"
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In this example, we first define an array of substrings substrings, and then use the join() method to join them into a single string joinedString using a comma and a space as the separator. The resulting string is then logged to the console.

If you omit the separator argument, the default separator (a comma) will be used:

index.ts
const substrings: string[] = ["apple", "banana", "cherry"];
const joinedString: string = substrings.join();

console.log(joinedString); // Output: "apple,banana,cherry"
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