Sublime

The module Stacklike thus implements stacklikeness by selectively deploying behaviors that already exist for Array objects: add an element to the end of the array, take an element off the end. Arrays are more versatile than stacks; a stack can’t do everything an array can. For example, you can remove elements from an array in any order, whereas by

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The Stacklike module in this listing uses an array (an ordered collection of objects) to represent the stack. The array is preserved in the instance variable @stack and made accessible through the method stack 1. That method uses a common technique for conditionally setting a variable: the ||= (or-equals) operator. The effect of this operator is to

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