Javascript Optional Chaining Array Length

https://www.javascript.com › try
Start learning JavaScript with our interactive simulator for free Our easy to follow JavaScript tutorials for beginners will have you coding the basics in no time

https://www.javascript.com › learn
Learn JavaScript basics for free with our easy to follow coding examples practice problems and basics tutorials Learn with us today

https://www.javascript.com › learn › strings
Learn the basics of JavaScript Strings with code examples and small tutorials and descriptions on how each string function and method works

https://www.javascript.com › about
Use our free JavaScript tutorials for programmers and useful JavaScript coding examples We have JavaScript basics for the beginners and advanced resources for the JavaScript experts

https://www.javascript.com › learn › functions
JavaScript functions are reusable blocks of code that perform a specific task taking some form of input and returning an output To define a function you must use the function keyword

https://www.javascript.com › learn › objects
JavaScript objects are variables that contain multiple data values The values within a JS object are known as properties Objects use keys to name values much like how is done with

https://www.javascript.com › learn › operators
Operators are the symbols between values that allow different operations like addition subtraction multiplication and more JavaScript has dozens of operators so let s focus on the

https://www.javascript.com › learn › arrays
Learn about array functions how to join two arrays the JavaScript last element in an array and length of array in JavaScript Arrays in JavaScript are container like values that can hold other

https://www.javascript.com › learn › numbers
The JavaScript number function is values that can be used in mathematical operations You don t need any special syntax for numbers just write them straight into JavaScript numbers Learn