Commit 7b65d6a

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update: preorder traversal

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Original file line number	Diff line number	Diff line change
`@@ -27,6 +27,15 @@ class BinarySearchTree {`
`27`	`27`	`}`
`28`	`28`	`return root;`
`29`	`29`	`}`
	`30`	`+`
	`31`	`+ preorder(root) {`
	`32`	`+ if (root === null) return;`
	`33`	`+ // eslint-disable-next-line no-console`
	`34`	+ console.log(`${root.value} `);
	`35`	`+`
	`36`	`+ this.preorder(root.leftChild);`
	`37`	`+ this.preorder(root.rightChild);`
	`38`	`+ }`
`30`	`39`	`}`
`31`	`40`
`32`	`41`	`// const bst = new BinarySearchTree(10);`
`@@ -39,4 +48,6 @@ class BinarySearchTree {`
`39`	`48`
`40`	`49`	`// console.log(bst.root);`
`41`	`50`
	`51`	`+// bst.preorder(bst.root);`
	`52`	`+`
`42`	`53`	`module.exports = BinarySearchTree;`

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