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The general use of these functions is in dynamic outputs, where we do not know how many times our function should iterate to collect all the data.
M AND M GENERATOR RIALTO HOW TO
How to Create Looping in PowerQuery and General Use That does not mean you should never use them, because they are extremely powerful if used properly. Since PowerQuery is not optimized for those operations, you should rely on them only as a last available option. Note to mention: these techniques, due to their iterative nature, tend to become very slow on large datasets or many iterations. Nevertheless, there are techniques to implement recursive or looping functions, and using a List.Generate() function is one of them. While looping is used regularly in object programming, in functional programming (which M is a part of), looping is not so easy to implement nor to understand.
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In that step, the condition in do-while row evaluated to false therefore aborting further iterations. The code iterated through X values until it reached value 10. If we execute this code in Excel, we will receive the following list of values. The following is a simple VBA code representation. The idea is to create a loop that is being executed until it reaches a certain condition. Basically, every important object in PowerQuery.ĭo while loop is commonly used in object programming. We will combine our knowledge of lists, records, functions, iterations, and looping techniques. In this blog, we will explain an advanced topic about the M language – using List.Generate to loop over a table.