r.expr(value) → value
Construct a ReQL JSON object from a native object.
If the native object is a Node.js Buffer, then expr will return a binary object. See binary for more information.
Example: Objects wrapped with expr can then be manipulated by ReQL API functions.
r.expr({a:'b'}).merge({b:[1,2,3]}).run(conn, callback)
Example: In JavaScript, you can also do this with just r.
r({a: 'b'}).merge({b: [1,2,3]}).run(conn, callback)
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https://rethinkdb.com/api/javascript/expr/