However, the JavaScript interpreter in older browsers (and IE) won’t be ale to recognize the new syntax introduced in this version. This chapter introduces some of the most notable and useful features introduced in ES6 and later versions of JavaScript-particularly those that will be utilized by the React framework (discussed in the following chapters).ĮS6 is mostly supported by modern browsers, with the notable exception of Internet Explorer. In 2015, a new version of the language was released-officially called “ECMAScript 2015”, most developers refer to it by the working name “ES6” (e.g., version 6 of the language). Lifecycle Example: Fetching Data via AJAXĪs discussed in Chapter 10, the ECMAScript specification for the JavaScript language has gone through several different versions, each of which adds new syntax and features to try and make the language more powerful or easier to work with.D.2 Handling Events in Class Components.A.3.4 Miscellaneous JavaScript Guidelines.Deprecated Alternative: Class Components.
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