What is the difference between Promises and Observables?

Observables and promises help us work with asynchronous functionality in JavaScript. Promises deal with one asynchronous event at a time, while observables handle a sequence of asynchronous events over a period of time.

PC Gaming Headset Headphone Hook Holder Hanger Mount, Headphones Stand with Adjustable & Rotating Arm Clamp, Under Desk Design, Universal Fit, Built in Cable Clip Organizer EURPMASK

(27325)

$12.99 (as of 30/06/2024 15:53 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

🎧【Clamp-on Headphone Stand】The E-Hold Series headphone holder fits desks from 0.31 inch to 1.57 inch thick, making it a versatile choice for most setups. The spring clamp is a breeze to remove and reattach. No glue, no mess. It blends seamlessly into... read more

LLEVTIC Computer Speakers, Desktop Speakers with 6 Colorful RGB Lights, Volume Control PC Speakers, USB Powered Gaming Speakers with 3.5mm Aux Cable for PC Monitor Laptop Tablet Phone

(1250)

44% Off $26.88 $14.99 (as of 30/06/2024 15:56 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

【Full-Range Stereo Sound Quality】Equipped with advanced sound drivers and a full-range 2.0 channel reinforced stereo core, this computer speakers provides the perfect atmosphere for your entertainment activities such as watching movies, gaming, and l... read more

Laptop Cleaning Kit Keyboard Cleaner, Keyboard Cleaning Kit Electronics Cleaning Tool for MacBook iPad Phone iPhone Pro, Brush Tool for Tablet, Computer, PC, TV Camera Lens Computer Vacuum Keyboard

(2045)

$16.98 (as of 30/06/2024 15:53 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

DEEP CLEAN YOUR DEVICE The electronics cleaner kit can effectively deep clean all your electronic devices such as mobile phones, tablets, TVs, etc. It comes with retractable large keyboard brush, polishing cleaning cloth X 2, keycap puller, metal pen... read more

UtechSmart Venus Pro RGB Wireless MMO Gaming Mouse, 16,000 DPI Optical Sensor, 2.4 GHz Transmission Technology, Ergonomic Design, 16M Chroma RGB Lighting, 16 programmable Buttons, Up to 70 Hours

20% Off $59.99 $47.99 (as of 30/06/2024 15:53 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

【Extensive Fully Programmable Buttons】16 customizable buttons can improve your gaming skills and performance by complex custom button macro coding of reconfiguration and assignment. The button custom function combines multiple keys into one button th... read more

Promise
always asynchronous
Promise emits a single value
Promises are not lazy
Promises cannot be canceled

Observable
either synchronous or asynchronous
return data many times as data change
lazy collections of multiple values over time
It’s a great approach for async operations
can be canceled using unsubscribe()

RIWUCT Foldable Laptop Stand, Height Adjustable Ergonomic Computer Stand for Desk, Aluminum Portable Laptop Riser Holder Mount Compatible with MacBook Pro Air, All Notebooks 10-16"

(3173)

26% Off $30.99 $22.99 (as of 30/06/2024 16:06 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

【Adjustable & Foldable】The laptop stand can raise your laptop up to 7.48 inches. You can incline at different angles and stand it up higher or lower depending on your needs, which will be extremely convenient if you use your laptop in a variety of po... read more

Portable, Waterproof Electronics Accessories Case and Organizer Bag for Cables, USB Drives and Chargers

14% Off $5.73 $4.90 (as of 30/06/2024 16:10 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Premium material: Made of Waterproof, Shockproof, Heavy-duty and Durable Material. Well padded semi-flexible interior, excellent protection for your gadgets against scratches, dust, impacts, and accidental dropping. Carrying Case External dimension: ... read more