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    Prepend/Append Data with RxJS Operators concat and startWith

    rxjsRxJS
    ^5.0.0

    Some Observables may complete, and we may want to append another Observable to the one which just completed. This lesson teaches you how to use the concat() operator for either appending or prepending, and how the shortcut operator startWith() is an easy way of prepending values to an Observable.