How to sum a variable by group

rr-faqdataframeaggregate
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Self-references in object literals / initializers

javascriptobject-literal
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Simulating group_concat MySQL function in Microsoft SQL Server 2005?

sqlsql-serversql-server-2005string-aggregation
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What is PECS (Producer Extends Consumer Super)?

javagenericssuperbounded-wildcardpecs
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Does JavaScript guarantee object property order?

javascriptobject
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