Basic Examples (2) 

Create a Map function that will apply a function f exclusively at parts of the expression lying at level 2:

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Apply the function just created to an expression that is of depth 3:

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Scope (3) 

MapLevel works with integer level specifications, just as Map does:

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MapLevel works with Association, just as Map does:

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MapLevel works at multiple levels of an association:

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Applications (1) 

Of people over age 40 on the Titanic, find the survival numbers broken down by cabin class, using MapLevel as part of a pipeline of operators:

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Properties and Relations (2) 

MapLevel produces what can be thought of as a nested Map operator:

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MapLevel provides a vocabulary for understanding how Query works:

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