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 TypeScript.
Looking to get a head start on your next software interview? Pickup a copy of the best book to prepare: Cracking The Coding Interview!
Javascript String substring in TypeScript With Example Code
JavaScript is a popular programming language used for web development. One of the most commonly used features of JavaScript is string manipulation. In TypeScript, a superset of JavaScript, string manipulation is also an important feature. One of the most useful string manipulation methods is the substring method.
The substring method is used to extract a portion of a string. It takes two parameters: the starting index and the ending index. The starting index is the position of the first character to be included in the substring, and the ending index is the position of the last character to be included in the substring.
Here is an example of how to use the substring method in TypeScript:
let str: string = "Hello, world!";
let substr: string = str.substring(0, 5);
console.log(substr); // Output: "Hello"
In this example, we declare a string variable called “str” and assign it the value “Hello, world!”. We then declare another string variable called “substr” and assign it the value of the substring of “str” starting at index 0 and ending at index 5. Finally, we log the value of “substr” to the console, which outputs “Hello”.
It is important to note that the substring method does not modify the original string. Instead, it returns a new string that contains the extracted portion of the original string.
In conclusion, the substring method is a useful tool for string manipulation in TypeScript. By understanding how to use this method, you can extract specific portions of a string to use in your code.
Equivalent of Javascript String substring in TypeScript
In conclusion, the TypeScript String class provides a substring function that is equivalent to the JavaScript substring function. The substring function in TypeScript allows developers to extract a portion of a string based on the starting and ending index values. This function is useful for manipulating strings in TypeScript applications and can be used in a variety of scenarios. By understanding the syntax and usage of the TypeScript substring function, developers can easily extract substrings from strings and perform various string operations in their TypeScript applications. Overall, the TypeScript substring function is a powerful tool for string manipulation and is a valuable addition to the TypeScript language.
Elevate your software skills
Ergonomic Mouse |
Custom Keyboard |
SW Architecture |
Clean Code |
