You Don't Know JS: Scope & Closures
SKU: 26387724828

You Don't Know JS: Scope & Closures

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Description

You Don't Know JS: Scope & Closures"No matter how much experience you have with JavaScript, odds are you dont 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. Youll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset."margin top: 4px; margin bottom: 14px; padding: 0px; font

"No matter how much experience you have with JavaScript, odds are you dont 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. Youll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset."margin-top: -4px; margin-bottom: 14px; padding: 0px; font-family: Arial, sans-serif; line-height: 22.4px; text-align: justify; background-color: rgb(255, 255, 255);"Like other books in the "You Dont Know JS" series, Scope and Closures dives into trickier parts of the language that many JavaScript programmers simply avoid. Armed with this knowledge, you can achieve true JavaScript mastery.
Learn about scope, a set of rules to help JavaScript engines locate variables in your code
Go deeper into nested scope, a series of containers for variables and functions
Explore function- and block-based scope, hoisting�, and the patterns and benefits of scope-based hiding
Discover how to use closures for synchronous and asynchronous tasks, including the creation of JavaScript libraries

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SKU: 26387724828

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4.3 ★★★★★
Based on 88 reviews
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Verified Purchase
Mopardodgegirl
Massapequa, US
★★★★★ 5
It works! Quality pillow.
Size: Standard (1 Count), Color: Original White (Cooling)
This does actually provide a cooling effect, and it's very comfortable! The accompanying literature is helpful too. I believe this to be a quality pillow for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
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Verified Purchase
jin
Carnegie, US
★★★★★ 5
Most comfortable pillow I’ve ever slept on
Size: Queen (1 Count), Color: Crescent White(cooling)
This is the most comfortable pillow I have ever slept on. It doesn't mash down like other pillows. Cradles my neck perfectly plus it’s cool. I broke my neck a couple of years ago and this pillow feels very good and comfortable. Definitely recommend to everyone. Ive used it since May and it’s retained its shape.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
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Verified Purchase
AreTrue
Birmingham, US
★★★★★ 4
Smell
Size: Queen (2 Count), Color: Original White (Cooling)
The fact that there are not more comments on the smell of these pillows has me worried about some of yall. Listen, I LOVE the weight, and the firmness, it’s perfect for that. However, these pillows are RANK. They have a very strong mildew-ish smell that lingers. I took the outer cover off and washed it and let the pillow air out for a few days, the smell is still very strong when you press your face against it, which one does because it is in fact designed for that purpose. It smells so bad. It’s nauseating. I can smell it through two pillowcases and blanket that I threw on top of them hoping an extra layer would trap the smell. I’ll bake them in the Texas sun tomorrow and hope that helps, because otherwise these are the perfect pillows for someone who wants to feel like they are hugging a torso but can’t stand the sound/feel of someone else breathing. I don’t know…4 stars, if the smell goes away I’ll come back. Update: many many days later. Either they don’t really smell anymore or I got use to it. They’ve held their firmness and shape well. I like them.
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Reviewed in the United States on March 9, 2026
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Verified Purchase
Samantha
Waukegan, US
★★★★★ 5
Actually Cooling Pillow
Size: Queen (1 Count), Color: Original White (Cooling)
This is a really nice pillow, I was worried it would be too soft or too firm but it's just right and it's actually cooling, it feels cool every time I touch it. I've noticed an improvement in sleep since using it. Would recommend!
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Reviewed in the United States on May 27, 2026
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Verified Purchase
Tyler and Kaela
Carnegie, US
★★★★★ 5
Repurchased in King Size – Still Love These Cooling Pillows
Size: King (2 Count), Color: Original White (Cooling), Size: King (2 Count), Color: Original White (Cooling)
After using the queen-size version of these pillows for over a year, we purchased the king-size set when we upgraded to a king mattress. Both my husband and I really like them. The cooling feature works well, and we like that each side feels different—when I run cold, I use the softer bamboo side, while my husband prefers the cooler side since he tends to sleep hot. They fit well in our king-size pillowcases and feel supportive in all sleeping positions, whether I’m on my stomach, side, or back. I also appreciate that you can remove some of the filling to adjust the firmness. The covers are washable, which makes them easy to maintain. Overall, we’re very happy with this repurchase and the long-lasting comfort.
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Reviewed in the United States on April 15, 2026

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