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Return -1 if target is not in array (#9)

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* return -1 if target is not in array

* return -1 if target is not in array (python)

* <= in binary search while loop
This commit is contained in:
Austin Green
2017-09-30 09:51:37 -04:00
committed by Yangshun Tay
parent ae70816718
commit 4fa28c04ee
2 changed files with 14 additions and 14 deletions
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14
utilities/javascript/binarySearch.js
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@ -1,7 +1,7 @@
function binarySearch(arr, target) {
let left = 0;
let right = arr.length - 1;
while (left < right) {
while (left <= right) {
let mid = left + Math.floor((right - left) / 2);
if (arr[mid] === target) {
return mid;
@ -12,15 +12,15 @@ function binarySearch(arr, target) {
right = mid - 1;
}
}
return left;
return -1;
}
console.log(binarySearch([1, 2, 3, 10], 1) === 0)
console.log(binarySearch([1, 2, 3, 10], 2) === 1)
console.log(binarySearch([1, 2, 3, 10], 3) === 2)
console.log(binarySearch([1, 2, 3, 10], 10) === 3)
console.log(binarySearch([1, 2, 3, 10], 9) === 3)
console.log(binarySearch([1, 2, 3, 10], 4) === 3)
console.log(binarySearch([1, 2, 3, 10], 0) === 0)
console.log(binarySearch([1, 2, 3, 10], 11) === 3)
console.log(binarySearch([5, 7, 8, 10], 3) === 0)
console.log(binarySearch([1, 2, 3, 10], 9) === -1)
console.log(binarySearch([1, 2, 3, 10], 4) === -1)
console.log(binarySearch([1, 2, 3, 10], 0) === -1)
console.log(binarySearch([1, 2, 3, 10], 11) === -1)
console.log(binarySearch([5, 7, 8, 10], 3) === -1)