How to Javascript String substring in C++

The JavaScript String substring() function is used to extract a portion of a string and return it as a new string. It takes two parameters: the starting index and the ending index of the substring. The starting index is inclusive, meaning the character at that index is included in the substring, while the ending index is exclusive, meaning the character at that index is not included in the substring. If the ending index is not specified, the substring will include all characters from the starting index to the end of the string. If the starting index is greater than the ending index, the substring function will swap the two values before extracting the substring. Keep reading below to learn how to Javascript String substring in C++.

Looking to get a head start on your next software interview? Pickup a copy of the best book to prepare: Cracking The Coding Interview!

Buy Now On Amazon

Javascript String substring in C++ With Example Code

JavaScript has a built-in method called substring() that allows you to extract a portion of a string. In C++, you can achieve the same functionality using the substr() method.

The substr() method takes two arguments: the starting index and the length of the substring you want to extract. Here’s an example:

std::string str = "Hello, world!"; std::string substr = str.substr(7, 5); // substr now contains "world"

In this example, we start at index 7 (which is the first character of the word “world”) and extract a substring that is 5 characters long.

If you only provide the starting index as an argument, the substr() method will extract the rest of the string from that index to the end:

std::string str = "Hello, world!"; std::string substr = str.substr(7); // substr now contains "world!"

Keep in mind that the starting index is zero-based, so the first character of a string is at index 0.

Equivalent of Javascript String substring in C++

In conclusion, the C++ programming language provides a powerful and efficient way to manipulate strings using the substring function. This function allows developers to extract a portion of a string based on a specified starting index and length. While the syntax and usage of the substring function in C++ may differ from its equivalent in JavaScript, the underlying functionality remains the same. By understanding how to use the substring function in C++, developers can create more robust and efficient string manipulation code. Overall, the substring function in C++ is a valuable tool for any developer working with strings and is worth exploring further.