Function cropDepth

Crop all nodes from a tree that are deeper than the given depth. For example:

import {leaf, branch, cropDepth} from 'effect-tree'

//  ┬1        A tree of depth=4
//  └┬2       with 3 branches and
//   └┬3      a single leaf.
//    └─4
//
const depth4: Tree<string> = branch(1, [branch(2, [branch(3, [leaf(4)])])]])

const depth2: Tree<string> = pipe(depth4, cropDepth(2))
//
//  ┬1        Has been cropped to a tree of depth=2
//  └─2       depth2 = branch(1, [leaf(2)])
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