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How to use observables in the Ionic framework?

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In the Ionic framework, observables are not specific to Ionic or Angular and they are provided with RxjS library. Observables are like a commitment but a lot of things can be worked out from it. It can deal with multiple values at a time rather than just resolving one value at that time. It can also be used to manipulate the data which is associated with it. Observables cannot be executed until and unless they are subscribed to. Various operations can be applied to observables for modification and returning to a new one. We can also create our own observable. The observable pattern is combined into one with the help of the subject which is preferred for simple implementations.

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