How to use 'Map For' In Niagara?

I just cannot make sense of it, nor find any documentation on it, how do you use this node?
24-07-126

I want to make a for loop that samples particles by index and returns their position, something like this.

But it complains about me trying to get the index before it’s created or something along those lines.

I figured it out, Map Set cannot be placed after Map For.

This worked:

You can also still use Map Set, but it must be placed before the map for (at least if it uses values that are generated during the for loop)

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