Returns true if the specified property name can be found in the specified object.
Syntax
propertyNameOrValue in objectName
Example
// Arrays
trees=new Array("redwood","bay","cedar","oak","maple")
0 in trees // returns true
3 in trees // returns true
6 in trees // returns false
"bay" in trees // returns false (you must specify the index number,
// not the value at that index)
"length" in trees // returns true (length is an Array property)
// Predefined objects
"PI" in Math // returns true
myString=new String("coral")
"length" in myString // returns true
// Custom objects
mycar = {make:"Honda",model:"Accord",year:1998}
"make" in mycar // returns true
"model" in mycar // returns true