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Article contents:== tree [[toc:]] This is an implementation of [[https://github.com/pre-srfi/trees/blob/master/spec.md|John Cowan's tree library]] with the following additional procedures added. === tree-find (tree-find pred tree default) Walks the tree in preorder and exits out early when a node (a subtree or atom) matches {{pred}}. Returns the first matching node, not a copy but the real one. If there is on match, return default, which is a mandatory argument. === tree-find-equal? (tree-find-equal? tree needle) Like {{tree-find}}, but finds the first node that's {{equal?}} to the {{needle}} or returns {{#f}} as a default. The reason you might need that is because many of the other operations in the library act on subtrees, not copies of subtrees. So this is a way for you to turn a copy into a reference to the original subtree. === tree-atoms-any? (tree-atoms-any? pred tree) Like {{tree-any?}}, but only consider atoms. === tree-atoms-every? (tree-atoms-every? pred tree) Like {{tree-every?}}, but only consider atoms. === tree-remove (tree-remove pred tree) Remove every node (whether subtrees or atoms) that matches {{pred}}. === Source code [[https://idiomdrottning.org/tree.scm]] Description of your changes:

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