What Does Setting the Length of a JavaScript Array Do? – onlinecode
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The most common pattern is setting the length of the array to 0.
Setting array.length = 0clears the array.
const array = [1, 2, 3, 4, 5];
array.length = 0;
array; // []Reducing the Array Length
While the most common pattern is assigning to 0, you can reduce the length of the array to remove elements from the end.
Reducing the array’s length is similar to array splice()
const array [1, 2, 3, 4, 5];
array.length = 3;
array; // [1, 2, 3]Increasing the Array Length
If you increase the length of the array, you’re adding “holes” at the end of the array.
const array = [];
array.length = 1;
array[0]; // undefined
array; // [ <1 empty item> ]This approach isn’t commonly used, because array holes are tricky to work with.
However, if you want to add several additional elements to an array, you can use .fill() as follows.
const array = [3, 2, 1];
array.length = 6;
array.fill(0, 3); // Fill with 0 starting at index 3 until 'length'
array; // [3, 2, 1, 0, 0, 0]The above fill() approach works, but you should typically use push() instead to use simpler syntax.
const array = [3, 2, 1];
array.push(...Array(3).fill(0));
array; // [3, 2, 1, 0, 0, 0]
JavaScript Fundamentals for Does Setting the Length of a JavaScript Array Do?
JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.
Here are some of the fundamentals of JavaScript:
- Variables: Variables are used to store data. They are declared using the
varkeyword. - Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
- Operators: Operators are used to perform operations on data.
- Control flow statements: Control flow statements allow you to control the order in which your code is executed.
- Functions: Functions are blocks of code that can be reused.
- Objects: Objects are used to store data in key-value pairs.
- Arrays: Arrays are used to store data in a sequential order.
- Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
- DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.
These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.
Here are some resources that you can use to learn more about JavaScript:
- Mozilla Developer Network (MDN): The MDN is a great resource for learning about JavaScript. It has a comprehensive reference guide, tutorials, and articles on a wide range of topics.
- W3Schools: W3Schools is another great resource for learning about JavaScript. It has interactive tutorials and quizzes that can help you learn the basics of the language.
- JavaScript.info: JavaScript.info is a website that provides in-depth tutorials on JavaScript. It also has a forum where you can ask questions and get help from other JavaScript developers.
I hope this helps!
Here are some additional tips for learning JavaScript:
- Start with the basics: Before you start trying to build complex applications, it’s important to learn the basics of JavaScript. This includes things like variables, data types, operators, and control flow statements.
- Practice regularly: The best way to learn JavaScript is to practice regularly. Try to find some time each day to work on JavaScript projects.
- Get help from others: If you get stuck, don’t be afraid to ask for help from others. There are many online forums and communities where you can get help from other JavaScript developers.
With a little practice, you’ll be able to learn JavaScript and start building amazing web applications(Does Setting the Length of a JavaScript Array Do?).
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