!! Complete PowerApps Interview Questions Reference !!
Trying to become a PowerApps app developer? Well, check the below questions and clear your interview easily.
In this post I am going to share with you all the PowerApps interview questions which are mostly asked for a developer role. I have collected these from various PowerApps interview. So it will give you an understanding of how PowerApps interview questions are for an experienced professional. Though this post is mainly for experienced professionals(1-2 years) but this can help a beginners as well.
**** PART – 2: PowerApps Interview Questions ****
To reduce document length, I have divided this PowerApps interview questions post in two parts. Part-II is mostly on coding explanation and scenario based questions.
Please check Part-I for descriptive questions.
<< Part-I of PowerApps Interview questions
#Q: What is formula in PowerApps? How many types are there?
By definition functions add additional capabilities to a product. Similarly in PowerApps has formulas as well.
PowerApps formula has many elements such as Functions, Signals, Enumerations and many more. Below are some examples.
Functions take parameters, perform an operation, and return a value. For example, Sqrt(25) returns 5.
Signals return information about the environment. For example, Location returns the device’s current GPS coordinates.
Enumerations return a pre-defined constant value. For example, Color is an enumeration that has pre-defined values for Color.Red, Color.Blue, and so forth.
#Q: How do you create a collection? How to add new values to it?
Collection is a special kind of data type. Use a collection to store data that users can manage in your app. A collection is a group of items that are similar, such as products in a product list.
To create collection
Collect( collectionName, { ParameterName: value1, ParameterName: value2 } );
#Q: How to update a particular item in a collection? Write an example.
We can use Patch() or ClearCollect() function to update or create a new particular item. For detailed example check this document.
#Q: How to define a local variable? What is the lifecycle of a local variable?
To create a local variable use the method UpdateContext(). Context variables ( or local variables) are available only in that screen you cannot access the value in other screen.
If you want to access a variable in the entire app then create a global variable. Global variables can be created using Set() method. Below are the examples,
Syntax: UpdateContext( { ContextVariable1: Value1 [, ContextVariable2: Value2 [, … ] ] } );
Example: UpdateContext( { Name: “Lily”, Score: 10 } );
Syntax: Set( VariableName, Value );
Example: Set( Counter, 1 );
#Q: Write an example of LookUp() function. How is it different from Filter() ?
The LookUp() function finds the first record in a table that satisfies a formula. Use LookUp() to find a single record that matches one or more criteria.
On the other hand, Filter() fetches all the records/items from a table that matches the criteria.
Syntax: LookUp(Table*, Formula [, ReductionFormula ] )
Example: LookUp(IceCream, Flavor = “Chocolate”, Quantity)
#Q: How to write Power Automate flow from PowerApps? Can we pass values to flows? Is it possible to retrieve result from Power Automate?
You can use Power Automate to create logic that performs one or more tasks when an event occurs in a canvas app. For example, configure a button so that, when a user selects it, an item is created in a SharePoint list and an email or meeting request is sent.
To connect to a Flow, first create the flow. After creating navigate back to the app and under Action menu choose the PowerAutomate you created.
Yes we can pass values/parameters to a Flow(). And it is possible to return results from Power Automate as well.
#Q: Write an example of Filter(). What is the use of Filter in PowerApps?
Syntax:
Filter(Table*, Formula1 [, Formula2, … ] )
As an example, Filter can be used to fetch details from data source depending on certain criteria. We can also use Filter and combine it with Patch function to update multiple items at the same time.
Example:
Filter(IceCream, OnOrder > 0);
Filter(IceCream, “chocolate” in Lower(Flavor ));
#Q: Write a Patch() function example.
You can use the Patch function to modify one or more records of a data source. Also, you can create records using patch function. To create a record, simply use the Defaults function to fetch the base record.
Syntax: Patch( DataSource, BaseRecord, ChangeRecord1 [, ChangeRecord2, … ])
Example:
Patch( Customers, First( Filter( Customers, Name = “Contoso” ) ), { Phone: “1-212-555-1234” } );
Patch( Customers, Defaults( Customers ), { Name: “Contoso” } )
#Q: Difference between IsError() and IfError(). How to chain functions using IfError()?
The IfError() function tests values until it finds an error. If the function discovers an error, the function evaluates and returns a corresponding replacement value and stops further evaluation.
On the other hand, the IsError() function tests for an error value and then returns a Boolean value true or false.
An example of IfError():
IfError(
Patch( DS1, … ), Notify( “problem in the first action” ),
Patch( DS2, … ), Notify( “problem in the second action” )
);
<< Part-I of PowerApps Interview questions
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Disclaimer: Although this post can definitely give you ideas and hints about PowerApps interview questions. But this post does not in any way guarantee your job. Although these questions are very common but reader should understand that depending on Company and Job requirement, questions can vary.
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