binary search added

Author: shams-nahid

.idea/workspace.xml

@@ -0,0 +1,30 @@
+let binarySearch = (numArray, myNumber, cb) => {
+
+    let arrayLength = numArray.length;
+    let middleIndex = Math.floor(arrayLength/2);
+
+    if (numArray[middleIndex] == myNumber) {
+        return cb(null, true);
+    } else if (numArray.length <= 1) {
+        return cb(null, false);
+    } else if(numArray[middleIndex] > myNumber) {
+        numArray = numArray.slice(0, middleIndex);
+        binarySearch(numArray, myNumber, cb);
+    } else if (numArray[middleIndex] < myNumber) {
+        numArray = numArray.slice(middleIndex, numArray.length);
+        binarySearch(numArray, myNumber, cb);
+    }
+};
+
+binarySearch([5, 7, 12, 16, 36, 39, 42, 56, 71], 56, (err, flag) => {
+    if (err) {
+
+    } else {
+        if (flag) {
+            console.log('Number found.');
+        } else {
+            console.log('Number not found.');
+        }
+    }
+});
+