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In Chapter 2, you make the following statement ...

"At this point it should be pretty clear that lambda functions, all by themselves, can be immensely powerful."

It is not "pretty clear" to me.
I don't see the value proposition from the examples presented.
No benefit has been shown over a named function.
You've illustrated how a where clause can be substituted.
But we already have the where clause, so how does this solution confer additional benefit over what is already available by using a where clause?
Please be precise as to exactly what you mean by "immense power".
What exactly can be done with a lambda function that cannot be done by other means and why exactly is this of immense value?

P.S. You followed this statement with an example to "drive home the point" in which you defined a function called "overwrite" but then failed to actually invoke it. Consequently, the point was not "driven home".