December 2016
Intermediate to advanced
841 pages
17h
English
Content preview from TypeScript: Modern JavaScript DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Learning modern JavaScript
JavaScript has different versions. Some of these are ES3, ES5, ES2015 (also known as ES6), and ES2016. Recent versions are named after the year in which they were introduced. Depending on the environment for which you write code, some features might be or might not be supported. TypeScript can compile new features of JavaScript to an older version of JavaScript. That is not possible with all features, however.
Recent web browsers support ES5 and they are working on ES2015.
We will first take a look at the constructs that can be transpiled to older versions.
let and const
ES2015 has introduced let and const. These keywords are alternatives to var. These prevent issues with scoping, as let and const are block scoped instead ...
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