MongoDB - Covered Query
A covered query is a query that can be satisfied entirely using an index and does not have to examine any documents. An index covers a query when both of the following apply:
all the fields in the query are part of an index, and
all the fields returned in the results are in the same index
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56. JavaScript Destructuring Assignment - Object Destructuring with 7 different use cases
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48. JavaScript Map: Map methods: set, get, delete, etc; iteration over Map; Map vs Object