Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain timestamp...
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Angular provides the DatePipe for formatting dates. You can use it directly in your templates with the pipe syntax, or you can use it programmatically in your components...
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Observables provide support for passing messages between parts of your application. They are use frequently in Angular applications for handling async data flows...
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