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Returns the first index into the specified vector object which the given object is found. #### Syntax indexOf( vector , object ) indexOf( vector, object , index ) vector.indexOf( object ) vector.indexOf( object , index ) #### Parameters
vector | the vector object to use.
object | the object to search for.
index | the starting index into the specified vector object.
#### Returns
integer | the index into the specified vector object. -1 if, the object is not found.
#### Example
    i = v.indexOf( o )
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