A common data type in JavaScript is the *associative array*, or more simply
the *object*, which has a set of named properties. The standard mechanism for
iterating over the keys (or property names) in an associative array is the
for…in loop. However, note that the iteration order is undefined.
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D3 provides several methods for converting associative arrays to standard
arrays with numeric indexes.
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Node.js is an event-based server-side JavaScript engine.
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