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learn javascript web dev for china skip to main content resources web platform dive into the web platform at your pace html css javascript user experience learn how to build better user experiences performance accessibility identity learn get up to speed on web development learn html learn css learn javascript learn ai learn performance learn accessibility more courses additional resources explore content collections patterns and more ai and the web explore pagespeed insights patterns podcasts shows developer newsletter about web dev baseline how to use baseline blog case studies resources ai privacy accessibility html images responsive design forms pwa css performance testing javascript resources more ai privacy accessibility html images responsive design forms pwa css performance testing javascript baseline how to use baseline blog case studies web platform html css javascript user experience performance accessibility identity learn learn html learn css learn javascript learn ai learn performance learn accessibility more courses additional resources ai and the web explore pagespeed insights patterns podcasts shows developer newsletter about web dev chrome is back at google i o may 19 20 register now web dev resources javascript stay organized with collections save and categorize content based on your preferences learn javascript an in depth course on the basics of javascript go back check_circle welcome to learn javascript keyboard_arrow_down keyboard_arrow_up subject article an in depth course on the basics of javascript read article check_circle introduction to javascript keyboard_arrow_down keyboard_arrow_up subject article a brief history of javascript and an overview of its basic rules read article check_circle data types and structures keyboard_arrow_down keyboard_arrow_up subject article the basic primitive data types of javascript read article check_circle numbers keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s number data type read article check_circle strings keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s string data type read article check_circle booleans keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s boolean data type read article check_circle null and undefined values keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s null and undefined data types read article check_circle bigint keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s bigint data type read article check_circle symbols keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript s symbol data type read article check_circle variables keyboard_arrow_down keyboard_arrow_up subject article learn how to use javascript variables read article check_circle comparison operators keyboard_arrow_down keyboard_arrow_up subject article learn how to use comparison operators read article check_circle control flow keyboard_arrow_down keyboard_arrow_up subject article learn about javascript s control flow read article check_circle introduction to functions keyboard_arrow_down keyboard_arrow_up subject article an introduction to javascript functions read article check_circle function expressions keyboard_arrow_down keyboard_arrow_up subject article an introduction to javascript function expressions read article check_circle the new keyword keyboard_arrow_down keyboard_arrow_up subject article call functions using the new keyword to create objects read article check_circle the return keyword keyboard_arrow_down keyboard_arrow_up subject article use the return keyword to get more out of your functions read article check_circle the this keyword keyboard_arrow_down keyboard_arrow_up subject article use the this keyword to work with the context your function executes in read article check_circle introduction to objects keyboard_arrow_down keyboard_arrow_up subject article introduction to javascript objects read article check_circle property accessors keyboard_arrow_down keyboard_arrow_up subject article learn how to set alter and access the properties of an object read article check_circle prototypal inheritance keyboard_arrow_down keyboard_arrow_up subject article javascript objects and prototypal inheritance read article check_circle property descriptors keyboard_arrow_down keyboard_arrow_up subject article use property descriptors to configure your javascript objects read article check_circle indexed collections keyboard_arrow_down keyboard_arrow_up subject article learn how to use indexed collections such as arrays read article check_circle keyed collections keyboard_arrow_down keyboard_arrow_up subject article learn how to use keyed collections such as maps and sets read article check_circle introduction to classes keyboard_arrow_down keyboard_arrow_up subject article learn how to use classes in javascript read article check_circle extend classes keyboard_arrow_down keyboard_arrow_up subject article the extends keyword lets you create subclasses of existing classes read article check_circle class fields and methods keyboard_arrow_down keyboard_arrow_up subject article use class fields and methods to add properties to your classes read article check_circle static initialization blocks keyboard_arrow_down keyboard_arrow_up subject article use static initialization blocks to set or alter static fields read article check_circle appendix keyboard_arrow_down keyboard_arrow_up subject article optional additional information that might be helpful on your javascript journey skip read article null null web dev web dev we want to help you build beautiful accessible fast and secure websites that work cross browser and for all of your users this site is our home for content to help you on that journey written by members of the chrome team and external experts contribute file a bug see open issues related content chrome for 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