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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The this operator
In JavaScript, the this operator behaves a little differently than other languages. The value of the this operator is often determined by the way a function is invoked. Its value cannot be set by assignment during execution, and it may be different each time a function is invoked.
Note
The this operator also has some differences when using the strict and nonstrict modes. To learn more about the strict mode, refer to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode.
The this operator in the global context
In the global context, the this operator will always point to the global object. In a web browser, the window object is the global object:
console.log(this === window); // true this.a = 37; console.log(window.a); ...
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