diff --git a/javascript/_1147.js b/javascript/_1147.js
new file mode 100644
index 0000000000..8cfb2266bc
--- /dev/null
+++ b/javascript/_1147.js
@@ -0,0 +1,27 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var dominantIndex = function(nums) {
+  var maxdata = -1;
+  var maxIndex = -1
+  
+  for( var i = 0 ;  i < nums.length; i++){
+      if(nums[i] > maxdata){
+          maxdata = nums[i];
+          maxIndex = i
+      }
+  }
+ 
+  for(var i = 0 ; i < nums.length; i++){
+      
+      if(i != maxIndex && nums[i] * 2 > maxdata){
+           return  -1
+
+      }
+      
+  }
+    return maxIndex;
+    
+};
+
diff --git a/javascript/_747.js b/javascript/_747.js
new file mode 100644
index 0000000000..8cfb2266bc
--- /dev/null
+++ b/javascript/_747.js
@@ -0,0 +1,27 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var dominantIndex = function(nums) {
+  var maxdata = -1;
+  var maxIndex = -1
+  
+  for( var i = 0 ;  i < nums.length; i++){
+      if(nums[i] > maxdata){
+          maxdata = nums[i];
+          maxIndex = i
+      }
+  }
+ 
+  for(var i = 0 ; i < nums.length; i++){
+      
+      if(i != maxIndex && nums[i] * 2 > maxdata){
+           return  -1
+
+      }
+      
+  }
+    return maxIndex;
+    
+};
+