TypeScript String concat()

In this chapter, we will explore the concat() method in TypeScript. This method is a built-in function that helps in combining two or more strings into a single string. Understanding how to use concat() is useful for manipulating and constructing strings effectively.

Table of Contents

1. Definition
2. Syntax
3. Examples
4. Conclusion

1. Definition

The concat() method concatenates (joins) two or more strings and returns a new string. This method does not modify the original strings but returns a new string that is the combination of all the input strings.

2. Syntax

string.concat(string1, string2, ..., stringN);

Parameters

• string1, string2, ..., stringN: The strings to be concatenated. You can pass one or more strings to be joined together.

Return Value

The method returns a new string that is the result of concatenating all the input strings.

3. Examples

Let's look at some examples to understand how concat() works in TypeScript.

Example 1: Basic Usage

In this example, we concatenate two strings.

let str1: string = "Hello";
let str2: string = "TypeScript";
let result: string = str1.concat(", ", str2, "!");
console.log(result); // Output: Hello, TypeScript!

Example 2: Concatenating Multiple Strings

In this example, we concatenate multiple strings.

let str1: string = "Learning";
let str2: string = "TypeScript";
let str3: string = "is";
let str4: string = "fun";
let result: string = str1.concat(" ", str2, " ", str3, " ", str4, "!");
console.log(result); // Output: Learning TypeScript is fun!

Example 3: Using concat() with Empty Strings

In this example, we use concat() with empty strings to see how it behaves.

let str1: string = "Hello";
let str2: string = "";
let str3: string = "World";
let result: string = str1.concat(str2, " ", str3, "!");
console.log(result); // Output: Hello World!

4. Conclusion

In this chapter, we explored the concat() method in TypeScript, which is used to concatenate two or more strings into a single string. We covered its definition, syntax, parameters, return value, and provided several examples to demonstrate its usage. Understanding how to use concat() effectively can help in various string manipulation tasks in TypeScript, especially when combining multiple strings.