{"product_id":"9781449335540","title":"You Don't Know JS: Scope \u0026 Closures","description":"\u003cp\u003eNo matter how much experience you have with JavaScript, odds are you don’t fully understand the language. This concise yet in-depth guide takes you inside scope and closures, two core concepts you need to know to become a more efficient and effective JavaScript programmer. You’ll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset.\u003c\/p\u003e\u003cp\u003eLike other books in the \"You Don’t Know JS\" series, \u003ci\u003eScope and Closures\u003c\/i\u003e dives into trickier parts of the language that many JavaScript programmers simply avoid. Armed with this knowledge, you can achieve true JavaScript mastery.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLearn about scope, a set of rules to help JavaScript engines locate variables in your code\u003c\/li\u003e\n\u003cli\u003eGo deeper into nested scope, a series of containers for variables and functions\u003c\/li\u003e\n\u003cli\u003eExplore function- and block-based scope, “hoisting”, and the patterns and benefits of scope-based hiding\u003c\/li\u003e\n\u003cli\u003eDiscover how to use closures for synchronous and asynchronous tasks, including the creation of JavaScript libraries\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"O'Reilly Media, Incorporated","offers":[{"title":"Default Title","offer_id":47143130824944,"sku":"9781449335540","price":15.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781449335540_p0.jpg?v=1763829758","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781449335540","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}