JS implementation of binary search and fast sorting algorithm

Source: Internet
Author: User

Two-Part search method

function Binary_search (Source_arr, target) {

var len = source_arr.length,

Start = 0,

End = Len-1,


while (start <= end) {

Middle = parseint ((start + end)/2);

Middle_val = Source_arr[middle];

if (Middle_val = = target) {

return middle;

}else if (Middle_val > target) {

end = Middle-1;


Start = middle + 1;





Time complexity: 2^x = n so time complexity is log2n, space complexity is n;

Hash table lookup (none)

Quick Sort

function Quick_sort (Source_arr, left, right) {

if (left < right) {

var key = Source_arr[left],

Start = left,

end = right;

while (Start < end) {

while (Start < end && Source_arr[end] > key) {



Source_arr[start] = Source_arr[end];

while (Start < end && Source_arr[start] < key) {

Start + +;


Source_arr[end] = Source_arr[start];


Source_arr[start] = key;

Quick_sort (Source_arr, left, start-1);

Quick_sort (Source_arr, start+1, right);



Time Complexity log2n~ n*n (n + n/2 + N/2 + N/4 + N/4 + N/4 + N/4 ...)

B-Tree, binary-tree traversal

JS implementation of binary search and fast sorting algorithm

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