August 2015
Intermediate to advanced
216 pages
4h 50m
English
Content preview from Clojure Data Structures and Algorithms CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Simulating a call stack using arrays
A call stack is a data structure that is built when a program runs. As function calls keep coming in, the information regarding their code is arranged in frames, that is, a frame per call or variable evaluation. And these frames are stacked up. The program execution is then a matter of "unwinding" these frames, that is, after a frame at the top of the stack has been evaluated, it is unstacked and the process resumes at the new frame that is now at the top of the call stack.
Here we will observe a simple rule to unwind: as the execution goes, if we unstack a variable, we store it, and when we encounter a function call to unstack, we store the return value of its call and pass to it the parameters that we've stored ...
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