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BinarySearch.js

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/**

* @function BinarySearch

* @description Search the integer inside the sorted integers array using Binary Search Algorithm.

* @param {Integer[]} arr - sorted array of integers

* @param {Integer} low - The input integer

* @param {Integer} high - The input integer

* @param {Integer} searchValue - The input integer

* @return {Integer} - return index of searchValue if found else return -1.

* @see [BinarySearch](https://en.wikipedia.org/wiki/Binary_search_algorithm)

*/

const binarySearch = (arr, searchValue, low = 0, high = arr.length - 1) => {

// base case

if (high < low || arr.length === 0) return -1

const mid = low + Math.floor((high - low) / 2)

// If the element is present at the middle

if (arr[mid] === searchValue) {

return mid

}

// If element is smaller than mid, then

// it can only be present in left subarray

if (arr[mid] > searchValue) {

return binarySearch(arr, searchValue, low, mid - 1)

}

// Else the element can only be present in right subarray

return binarySearch(arr, searchValue, mid + 1, high)

}

export { binarySearch }