Update js codes.docx

Author: priya42bagde

js codes.docx

@@ -3102,7 +3102,80 @@ However, if you use the assignment operator for a reference value, it will not c
 
  JS objects (as non-primitive data types) differ because they have reference values and those values are mutable. This means they share a memory address when shallow copied.
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-
+Airbus Interview Question:
+function countOccurance(arr){
+ let map ={}, sortedArr = arr.sort((a,b)=>a-b);
+  for(var item of sortedArr){
+    if(!(item in map)){ map[item] = 0}
+    map[item]++;
+  }
+  return map;
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+ let map ={}, sortedArr = arr.sort((a,b)=>a-b);
+  for(var item of sortedArr){
+    if(map[item] ==null){ map[item] = 0}
+    map[item]++;
+  }
+  return map;
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+ let map ={}, sortedArr = arr.sort((a,b)=>a-b);
+  for(var item of sortedArr){
+  if(map.hasOwnProperty(item)){
+    map[item] = map[item] + 1
+  }else{
+    map[item] = 1; 
+  }
+  }
+  return map;
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+  let map ={}, sortedArr = arr.sort((a,b)=>a-b); 
+  for(var item of sortedArr){
+   map[item] = map[item]+1 || 1
+  }
+  return map
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+  let map ={}, sortedArr = arr.sort((a,b)=>a-b); //[0,1,3,4,4,11,21,21,32,34,54,91,91]
+  for(var item of sortedArr){
+   map[item] = (map[item] || 0) + 1
+  }
+  return map
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+  let map ={}, sortedArr = arr.sort((a,b)=>a-b);
+  for(var item of sortedArr){
+  if(map[item]){
+ map[item] = map[item] + 1
+  }else{
+  map[item] = 1; 
+  }
+  }
+  return map;
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
+-------------------------------------------------------------------
+function countOccurance(arr){
+  let map ={}, sortedArr = arr.sort((a,b)=>a-b); 
+  for (var i=0; i<sortedArr.length; i++) 
+   {
+   map[sortedArr[i]] = map[sortedArr[i]] ? map[sortedArr[i]]+1 : 1; 
+   }
+  return map
+}
+console.log(countOccurance([1, 4, 91, 21, 91, 0, 32, 4, 11, 3, 54, 34, 21]))
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