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Add enter, exit terms #25

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May 27, 2019
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Add enter, exit terms #25

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16 changes: 16 additions & 0 deletions readme.md
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Expand Up @@ -325,6 +325,22 @@ traversal][traversal] that performs the following steps for each node _N_:
2. **R**: traverse [_tail_][term-tail]
3. **N**: visit _N_ itself

###### Enter

**Enter** is a step right before other steps performed on a given node _N_ when
[**traversing**][traversal] a tree.

For example, when performing _preorder_ traversal, **enter** is the first step
taken, right before visiting _N_ itself.

###### Exit

**Exit** is a step right after other steps performed on a given node _N_ when
[**traversing**][traversal] a tree.

For example, when performing _preorder_ traversal, **exit** is the last step
taken, right after traversing the [_tail_][term-tail] of _N_.

## Tree traversal

**Tree traversal** is a common task when working with a [_tree_][term-tree] to
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