In JavaScript, Promises act as containers for values that will be available in the future, regardless of whether they signify success or failure.
Essentially, a Promise guarantees the delivery of a value at a specified time in the future. The type of value within the Promise doesn't matter much; what's crucial is grasping the essence of this essential feature.
While other languages like Dart use the term "Future" for similar constructs, "Promise" provides a more intuitive mental model. It reflects the uncertainty inherent in waiting for future outcomes—perpetual execution represents a potential flaw, akin to a task endlessly leaking resources.
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