This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
2 el is forgiving. it will coerce the operands to fit into the context of operators.
there are vastly different number of combinations of such expressions possible in EL . the best way to do is to make a small program and play with such expressions. cook your own expression , see the results and then analyse it.