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ArrayIndexOutOfBoundsException - Examples, Causes & Fixes. An array-index out of bounds exception is a Java exception thrown due to the fact that the program is trying to access an. element at a position that is outside an array limit, hence the words Out of bounds. In other words, the program is trying to. access an element at an index that is outside the array bounds.
This method is similar in purpose to Kernel#Array, but there are some differences: 1  If the argument responds to to_ary the method is invoked. 2  If the returned value from to_ary is neither nil nor an Array object, Kernel#Array raises an exception, while Array.wrap does not, it just returns the value. It does not call to_a on the argument, if the argument does not respond to to_ary it returns an array with the argument as its single element.