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Merged
pomkarnath98 merged 1 commit into from
Oct 11, 2020
Merged

binary search recursive algorithm added #453

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29 changes: 29 additions & 0 deletions Recursive/BinarySearch.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@

// https://en.wikipedia.org/wiki/Binary_search_algorithm
// Search the integer inside the sorted integers array using Binary Search Algorithm

const BinarySearch = (intArr, searchQuery) => {
if (searchQuery === null || searchQuery === undefined || intArr.length === 0) {
return false
}

const middleIndex = intArr.length === 1 ? 0 : Math.ceil(intArr.length / 2)

if (intArr[middleIndex] === searchQuery) {
return true
} else if (intArr.length > 1) {
return intArr[middleIndex] < searchQuery ? BinarySearch(intArr.slice(1, middleIndex)) : BinarySearch(intArr.slice(middleIndex))
} else {
return false
}
}

// testing
(() => {
console.log('Number Present with odd array length: 5 = ', BinarySearch([1, 2, 3, 4, 5, 6, 7], 5))
console.log('Number Present with even array length: 5 = ', BinarySearch([1, 2, 4, 5, 6], 5))
console.log('Number Present with only single element: 5 = ', BinarySearch([5], 5))
console.log('Number Not Present: 0 = ', BinarySearch([1, 2, 3, 4, 5], 0))
console.log('Undefined number search query = ', BinarySearch([1, 2, 3, 4, 5]))
console.log('With Empty array = ', BinarySearch([], 1))
})()