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On Error Resume Next – When a list or collection of items of the same data type are stored in continuous memory locations, we call it an array. Arrays are useful objects that are widely used in software development to organize data. Here are some concrete examples of where you could use them:

I’ll show you some example arrays, then we’ll see how to check if one is empty.

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The code above prints a list of days when iterating through the array that was created when the string was split and stored.

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In VBA, unless we first define the size of an array, we cannot use the Lbound() and UBound functions. It will throw an error. We must therefore use the Redim keyword and define a size as soon as we declare an array.

Also, there is no specific function that can validate the existence of data in an array. So we have to use the other available functions, as well as some logic, to determine if an array is empty or not.

Just as we used the split function to split a string into an array, a Join function can be used to concatenate all the elements of an array into a single string.

Is the character that is going to be placed between the concatenation of every two elements when joining array elements. This is an optional parameter and if not provided, a space ” ” is used by default.

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If a zero-length string “” is provided as the delimiter, the join occurs without inserting any characters during concatenation.

So, all array elements are first concatenated using Join function and then the length of the resulting string can be checked to see if the array is empty or not.

The code snippet below can be added to the sample code above to warn you if the array is empty or not.

Using a For loop, we can loop through each element of an array to validate if the array contains data or if it is completely empty. Here is a ready-made function for you.

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Because an error will be generated if we use the Ubound or Lbound function on an empty array, we will use the “On Error Resume Next” statement and catch the error number to test if the array is empty. Here the array is considered empty if it has no defined size. I created a function to help you better understand and use the code.

A byte array is nothing but a series or characters. A string can be directly assigned to a byte array. Two elements of an array are used to allocate space for one character in a string. The code below should help you understand better.

In VBA, other than the StrPtr() function for byte arrays, there are no direct methods to find out if an array is empty or not. However, our best friend, Magical VBA, offers flexible functions that can be combined with your own logic to check the size of an array or whether or not data exists in an array of any data type.

The meaning of “EMPTY” here belongs to the user. It can be either an array that has no defined size, or an array that has a specific size but contains no data.

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Of the above methods, I recommend just grabbing a user-defined function that you can easily use to check whether an array is empty or not.

Lakshmi Ramakrishnan is an automation specialist, with experience as a trainer, solution architect, tester and developer. She has built VBA tools in everything from accounting to computer science and likes to share her expertise and knowledge to help beginners notice the Observable source and instead of passing it to observers replace it by another element or sequence of elements, potentially allowing the resulting Observable to terminate normally or not terminate at all.

There are several variations of the Catch operator and a variety of names used by different implementations to describe this operation, as you can see in the sections below.

In some implementations there is an operator called something like “OnErrorResumeNext” which behaves like a variation of Catch: reacting specifically to a

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Observable source notification. In others, there is an operator by that name that behaves more like a variation of Concat: performing the concatenation operation whether the source Observable exits normally or with an error. It’s unfortunate and confusing, but we have to live with it.

. This operator takes two arguments, both of which are functions of your choice that accept the exception thrown by

Swallows the error, calls the second function (which returns an Observable), and forwards emissions and notifications from this new Observable to its observers.

You can replace the function’s first parameter (the predicate that evaluates the exception) with a class object representing a variety of exceptions. If you do this,

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RxGroovy implements the Catch operator the same way as RxJava. There are three separate operators that provide this functionality:

Instructs an Observable to continue emitting objects after encountering an exception (but not another variety of throwable)

Will instead begin mirroring a second Observable backup. If the Throwable is not an Exception, the Observable returned by

Instructs an Observable to start emitting a second Observable sequence if it encounters an error or if the source Observable terminates normally

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RxKotlin implements the Catch operator in the same way as RxJava. There are three separate operators that provide this functionality:

The operator has a variant that allows you to specify the type of exception you want to catch. If you use this variant of the operator, all other exceptions will be passed to the observer as if the

Instructs an Observable, if it encounters an error, to start emitting from a set of other Observables, one Observable at a time, until one of those Observables completes successfully

Instructs an Observable to concatenate the elements emitted by a set of other Observables, one Observable at a time, whether the source Observable or any subsequent Observable ends in error

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A set of save Observables either as individual function parameters or as a single array of Observables. If he meets a

Notification from the source Observable, it will subscribe and start mirroring the first of those backup Observables. If this backup Observable itself emits a

Will swallow it and move to the next Observable save. If one of these Observables emits a

A set of save Observables either as individual function parameters, or as a single array of Observables, or as a factory function that generates Observables. When the source Observable completes, either normally or with an error,

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Subscribe and begin mirroring the first of those backup Observables, then recursively continue this concatenation process for each additional Observable until there are no more Observables to mirror, time at which he will transmit the

Instructs an Observable to start emitting from another Observable, or from an Observable returned by an action, if it encounters an error

Instructs an Observable to concatenate the elements emitted by another Observable to the sequence emitted by the source Observable, whether the source Observable terminates normally or with an error

Inherits Rx.NET’s misleading nomenclature in that it concatenates the second Observable sequence to the source sequence, whether that source sequence ends normally or with an error.

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Handles a special case: a source Observable that does not conform to the Observable contract such that it can intertwine

Notifications with emissions from an Observable of your choice without unsubscribing from the source, so all future items emitted by the source will be delivered to observers as if the sequence had not been interrupted by a

Is designed to work with pathological source Observables that do not terminate after an error is thrown, it is mostly useful in debugging/testing scenarios.

Directly to the source pathological Observable, and not to this Observable after it has been modified by additional operators, since these operators can effectively renormalize the source Observable by unsubscribing immediately after it throws an error. Above, for example, is an illustration showing how

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Will not react to the two errors generated by the two Observables, only to the single error passed by When an error occurs in a Mule application, an Error Handler component routes the error to the first On-Error component (On Error Continue or On Error Propagate ) configuration that matches the Mule error, such as

(the default for all Mule errors). If no error handling is configured for the error, the application follows a default error handling process.

, i.e. the Flow or Try scope where they are defined. Additionally, On-Error components can be defined in a global error handler, affecting the entire Mule application.

Executes but propagates the error to a higher level, such as a containing scope (for example, to a stream that contains a Try scope where the error occurs) or an outer stream containing a stream reference to the stream in which a error occurs. The error interrupts the execution of the owner and propagates to this higher level, causing

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