in ... (Keyword)

Part of the for ... in code execution mechanism.

Availability:

ECMAScript edition - 2
JavaScript - 1.0
JScript - 1.0
Internet Explorer - 3.02
Netscape - 2.0
JavaScript syntax:-for(aVariable in anObject) { someCode }
Argument list:anObjectAn object to be examined for properties.
aVariableA variable to store each enumerated property name in
someCodeSome script source to execute for each enumeration

See also:in

Refer to:

for( ... in ... ) ...

Cross-references:

ECMA 262 edition 2 - section - 12.6.3

ECMA 262 edition 3 - section - 11.8.7