Efficiency Through Pipelines
Understand how to build efficient concurrent programs by mastering RxJS observable pipelines. Explore how chaining operators in Observables differs from array methods, enabling single-pass transformations through lazy evaluation and improving performance in reactive applications.
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The first time I chained a bunch of operators into a pipeline to transform a sequence, my gut feeling was that it couldn’t possibly be efficient. I knew transforming arrays in JavaScript by chaining operators is expensive. Yet in this course, we’ll design our program by transforming sequences into new ones. Isn’t that terribly inefficient?
Chaining in the pipeline
Chaining looks similar in Observables and in arrays; there are even methods like filter and map that are present in both types. But there’s a crucial difference:
Array methods create a new array as a result of each operation, which is traversed entirely by the next operation.
Observable pipelines, on the other hand, don’t create ...