Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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javascript only: debugg the following code to pass specs. 

function findFirstNodes (root) {
let stack(queue) = [root];
//root. level = 0;
const firsts = [];
}
while (stack.length != 0) {
const curr = stack.pop();
}
if (!firsts [curr.level]) {
| | firsts.push(curr.value);
}
if (curr.left) {
}
stack.shift(curr.left);
return firsts;
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Transcribed Image Text:function findFirstNodes (root) { let stack(queue) = [root]; //root. level = 0; const firsts = []; } while (stack.length != 0) { const curr = stack.pop(); } if (!firsts [curr.level]) { | | firsts.push(curr.value); } if (curr.left) { } stack.shift(curr.left); return firsts;
class TreeNode {
constructor(value, left, right, level) {
}
}
this.value = value;
this. left = left;
this.right = right;
this.level = level
// Given a tree, find the first (left-most) node at each
// level of the tree and return it in an array, with the root at the
// 0th index, and the left-most node in the deepest level of the tree
// in the last index.
//
//
//
//
//
//
//
//
//
1
5
/ \
4
3
/
8
7
1
2
/ \
4
9
2 4
// Expected Output -> [ 5, 4, 1, 8, 2 ]
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Transcribed Image Text:class TreeNode { constructor(value, left, right, level) { } } this.value = value; this. left = left; this.right = right; this.level = level // Given a tree, find the first (left-most) node at each // level of the tree and return it in an array, with the root at the // 0th index, and the left-most node in the deepest level of the tree // in the last index. // // // // // // // // // 1 5 / \ 4 3 / 8 7 1 2 / \ 4 9 2 4 // Expected Output -> [ 5, 4, 1, 8, 2 ]
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