recursion

The difference between head & tail recursion [duplicate]

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In head recursion, the recursive call, when it happens, comes before other processing in the function (think of it happening at the top, or head, of the function). In tail recursion, it’s the opposite—the processing occurs before the recursive call. Choosing between the two recursive styles may seem arbitrary, but the choice can make all … Read more

recursive array_diff()?

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There is one such function implemented in the comments of array_diff. function arrayRecursiveDiff($aArray1, $aArray2) { $aReturn = array(); foreach ($aArray1 as $mKey => $mValue) { if (array_key_exists($mKey, $aArray2)) { if (is_array($mValue)) { $aRecursiveDiff = arrayRecursiveDiff($mValue, $aArray2[$mKey]); if (count($aRecursiveDiff)) { $aReturn[$mKey] = $aRecursiveDiff; } } else { if ($mValue != $aArray2[$mKey]) { $aReturn[$mKey] = $mValue; } … Read more

how to render child components in react.js recursively

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Here’s an alternative in ES6: import React, { Component, PropTypes } from ‘react’ export default class Comments extends Component { render() { const { children } = this.props return ( <div className=”comments”> {children.map(comment => <div key={comment.id} className=”comment”> <span>{comment.content}</span> {comment.children && <Comments children={comment.children}/>} </div> )} </div> ) } } Comments.propTypes = { children: PropTypes.array.isRequired } And … Read more

The idiomatic way to implement generators (yield) in Golang for recursive functions

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I. Alternatives Foreword: I will use a much simpler generator, because the problem does not concern the generator complexity but rather the signals between the generator and consumer, and the call of the consumer itself. This simple generator just generates the integer numbers from 0 to 9. 1. With a function value A generate-consumer pattern … Read more

Recursive diff of two dictionaries (keys and values)?

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In case you want the difference recursively, I have written a package for python: https://github.com/seperman/deepdiff Installation Install from PyPi: pip install deepdiff Example usage Importing >>> from deepdiff import DeepDiff >>> from pprint import pprint >>> from __future__ import print_function # In case running on Python 2 Same object returns empty >>> t1 = {1:1, … Read more