var 
ape = new Q.ComplexNumber(),
bee = new Q.ComplexNumber( 1 ),
elk = new Q.ComplexNumber( 1, 2 ),
fox = new Q.ComplexNumber( elk )

ape.toText()//  Returns '0'
bee.toText()//  Returns '1'
elk.toText()//  Returns '1 + 2i'
fox.toText()//  Returns '1 + 2i'

elk.isEqualTo( fox )   //  Returns true
elk.index === fox.index//  Returns false