Tag Archives: functions

Power Query M Primer (part 3):
Functions: Function Values, Passing, Returning, Defining Inline, Recursion

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Not only can you define and invoke functions (as we covered in part 2), you can also pass them around. The ability to pass a function around without invoking it gives lots of flexibility.

Sounds complex? Yes, in words, but not necessarily in practice. If you’ve touched the Power Query M language, you’ve probably already passed functions around—just perhaps without realizing about it.

Then there’s the mysterious each. It shows up a lot in code generated by the query editor. What does it actually mean or do? Turns out, it’s a handy shortcut that can simplify code you write.

We have ground to cover. Let’s get going!
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Power Query M Primer (part 2):
Functions: Defining

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If you read part 1 in this series, you may have picked up a theme about expressions that produce values: A simple statement, like 1, is an expression that produces a value. let is also an expression that produces a value.

Guess what? A function is an expression that ultimately produces a value. Unlike the expressions we looked at last time, a function only produces this value when it’s invoked.

Usually, parameters are passed to a function when it’s invoked. The function can reference these inputs as it computes what it will return. Continue reading