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JavaScript-Interview-Questions/trees/006.js at master · SHTprogrammer/JavaScript-Interview-Questions · GitHub
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trees
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006.js
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/*
* <!--
* This program is distributed under
* the terms of the MIT license.
* Please see the LICENSE file for details.
* -->
*/
/*
* Write an algorithm to do preorder traversal of the binary search
* tree below. The traverse operation should take a delegete to print
* the value of the node being traversed. Use the node structure in 002.js
*
* 110
* / \
* 62 141
* / \ / \
* 28 79 130 190
* /
* 121
*/
/*____________________________________________________________________________*/
/**
*
@class
{public} Node
*
* A typical binary tree node.
*
*
@param
{
Node
} left - the left node.
*
@param
{
Node
} right - the right node.
*
@param
{
Integer
} value - the value of this node.
*/
function
Node
(
left
,
right
,
value
)
{
this
.
left
=
left
;
this
.
right
=
right
;
this
.
value
=
value
;
}
/*
* Sample tree structure.
*/
var
root
=
new
Node
(
new
Node
(
new
Node
(
null
,
null
,
28
)
,
new
Node
(
null
,
null
,
79
)
,
62
)
,
new
Node
(
new
Node
(
new
Node
(
null
,
null
,
121
)
,
null
,
130
)
,
new
Node
(
null
,
null
,
190
)
,
141
)
,
110
)
;
/**
* Sample delegate.
*/
function
delegate
(
node
)
{
console
.
log
(
node
.
value
)
;
console
.
log
(
node
)
;
}
/**
*
@function
{
public static
} preorderTraversal
*
* Does a pre-order traversal on the tree.
*
*
@param
{
Node
} node - the node to start.
*
@param
{
Function
} delegate - the delegate to execute for each node.
*/
function
preorderTraversal
(
node
,
delegate
)
{
if
(
node
===
null
)
{
return
;
}
delegate
(
node
)
;
preorderTraversal
(
node
.
left
,
delegate
)
;
preorderTraversal
(
node
.
right
,
delegate
)
;
}
/*____________________________________________________________________________*/
preorderTraversal
(
root
,
delegate
)
;
/*
Output: ($ /usr/bin/node 006.js)
110
{ left:
{ left: { left: null, right: null, value: 28 },
right: { left: null, right: null, value: 79 },
value: 62 },
right:
{ left: { left: [Object], right: null, value: 130 },
right: { left: null, right: null, value: 190 },
value: 141 },
value: 110 }
62
{ left: { left: null, right: null, value: 28 },
right: { left: null, right: null, value: 79 },
value: 62 }
28
{ left: null, right: null, value: 28 }
79
{ left: null, right: null, value: 79 }
141
{ left:
{ left: { left: null, right: null, value: 121 },
right: null,
value: 130 },
right: { left: null, right: null, value: 190 },
value: 141 }
130
{ left: { left: null, right: null, value: 121 },
right: null,
value: 130 }
121
{ left: null, right: null, value: 121 }
190
{ left: null, right: null, value: 190 }
*/
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