March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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Variable
The $map operator applies a sub-expression to each of the elements of an array and returns the array of the resulting values. It accepts named parameters.
The $let operator defines variables for use within the scope of a subexpression and returns the result of the subexpression. It accepts named parameters.
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