TypeScript String includes()

🎓 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 (178K+ subscribers): Java Guides on YouTube

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

In this chapter, we will explore the includes() method in TypeScript. This method is a built-in function that helps in determining whether one string contains another substring. Understanding how to use includes() is useful for checking the presence of substrings within strings.

Definition
Syntax
Examples
Conclusion

1. Definition

The includes() method determines whether one string contains another substring. It returns true if the substring is found within the string, and false otherwise.

2. Syntax

string.includes(searchString, position?);

Parameters

searchString: The substring to search for within the string.
position (optional): The position within the string at which to begin searching for searchString. Defaults to 0.

Return Value

The method returns a boolean value: true if the searchString is found within the string, otherwise false.

3. Examples

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

Example 1: Basic Usage

In this example, we check if a string contains a specific substring.

let str: string = "Hello, TypeScript!";
console.log(str.includes("TypeScript")); // Output: true
console.log(str.includes("JavaScript")); // Output: false

Example 2: Using `includes()` with Position

In this example, we use the position parameter to start the search from a specific index.

let str: string = "Hello, TypeScript!";
console.log(str.includes("Type", 7)); // Output: true
console.log(str.includes("Hello", 1)); // Output: false

Example 3: Case Sensitivity

The includes() method is case-sensitive. In this example, we see how case sensitivity affects the result.

let str: string = "Hello, TypeScript!";
console.log(str.includes("typescript")); // Output: false
console.log(str.includes("TypeScript")); // Output: true

Example 4: Searching for an Empty String

In this example, we search for an empty string within another string.

let str: string = "Hello, TypeScript!";
console.log(str.includes("")); // Output: true

4. Conclusion

In this chapter, we explored the includes() method in TypeScript, which is used to determine whether a string contains another substring. We covered its definition, syntax, parameters, return value, and provided several examples to demonstrate its usage. Understanding how to use includes() effectively can help in various string manipulation tasks in TypeScript, especially when checking for the presence of substrings within strings.

My Top and Bestseller Udemy Courses. The sale is going on with a 70 - 80% discount. The discount coupon has been added to each course below:

Spring Boot + RabbitMQ Course - The Practical Guide

Java Guides

Search This Blog