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How to use Recursion to Traverse JSON Objects and the Filesystem. Recursion is a process in which a function calls itself. It is important to be able to recognize when a problem is best solved recursively. All iterative programs can be written using recursion, and all recursion programs are written using iteration. This is because it is much simpler to write an interpreter that can handle recursion than it is to write one that supports loops. The primary reason to choose recursion over iteration is simplicity.
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