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Type: Bug
Resolution: Duplicate
Priority: Major - P3
Fix Version/s: None
Affects Version/s: 2.0.3, 2.1.0
Component/s: JavaScript
Labels:
None
Environment:
I think in all environment, but my is "Linux azat 2.6.38custom1.0 #1 SMP Mon May 23 17:17:08 MSD 2011 x86_64 GNU/Linux"

/**

 * js increment operators (ob.prop += ob2.prop) do not work, after assigment like this ob = ob2

 * Affected versions:	r2.1.0-1580-g0c1a6bd (v8)

 * 				v8 engine: Version 3.9.23

 * 				2.0.3-1 (spider monkey)

*/

db.eval(function() {

	var ob2 = null;

	var ob1 = {foo: 1};

	ob2 = ob1;

	// if uncomment, than works

// 	ob2 = {};

// 	for (i in ob1) {

// 		ob2[i] = ob1[i];

// 	}

	ob2.foo += ob1.foo;

	assert(2 == ob2.foo, "increment #2, must be: 2");

	assert(ob2.foo == (1 + ob1.foo), "increment #1, must be: " + ob2.foo);

	return ob2.foo;

});

is duplicated by

SERVER-5417 js add property do not work at emit()

SERVER-8624 Remove read-only constraint on Reduce function values

related to

DOCS-981 Document JavaScript interface changes related to v8 switch