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Microsoft® JScript™
for...in Statement
 Language Reference 
Version 1 

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Executes a statement for each element of an object or array.
for (variable in [object | array])

The for statement syntax has these parts:

Part Description
variable A variable that can hold any of the elements of object.

object, array An object or array over which to iterate.
statement The statement to be executed for each member of object. Can be a compound statement.

Before each iteration of a loop, variable is assigned the next element of object. You can then use it in any of the statements inside the loop exactly as if you were using the element of object.

When iterating over an object, there is no way to determine or control the order in which the members of the object are assigned to variable.

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