Created BinarySearch.js (codinasion#2983)

Wrote a JavaScript program to Binary search a array

Author: vedha-vikash-pixel

dsa/binary-search/BinarySearch.js

@@ -0,0 +1,22 @@
+function BinarySearch(arr,target){   //Binary function
+    let start = 0;
+    let end = arr.length-1;     
+    let middle;
+    while(start<=end){
+        middle = Math.floor((start + end)/2);
+        if(arr[middle] === target){
+            return middle;
+        }
+        else if(arr[middle] > target){
+            end = middle - 1;
+        }
+        else{
+            start = middle + 1;
+        }        
+    }
+    return -1;          //return -1 if element not found
+}
+
+let arr = [10 ,20 ,30 ,40 ,50 ,60 ,70 ,80 ,90 ,100];
+let target = 30;
+console.log(BinarySearch(arr,target));  //2