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Create BinarySearch.js #26

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27 changes: 27 additions & 0 deletions 9_BinarySearch/BinarySearch.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
let BinarySearch = (list,val)=>{
let left = 0;
let right = list.length - 1;
let mid = Math.floor((left + right) / 2);

while (list[mid] !== val && left <= right) {
if (val < list[mid]) {
right = mid - 1
} else {
left = mid + 1
}
mid = Math.floor((left + right) / 2);
}
if (list[mid] === val) {
return mid;
} else {
return -1
}

}
;

let list = [1,2,3,4,5,6,7,8]
let val = 3;
// should return 2

BinarySearch(list, val);