Question

How to count the number of keys/properties of an object in JavaScript

Answer 1

let obj = {
  id: 383912,
  name: "Albus Dumbledore",
  academicrank: "Professor"
};

let count = 0;
for (k in obj){
  if (obj.hasOwnProperty(k)) {
    count++;
  }
}

console.log(count);

  
  
    
    
/*
run:
    
3
    
*/

 

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Answer 2

let obj = {
  id: 383912,
  name: "Albus Dumbledore",
  academicrank: "Professor"
};


console.log(Object.keys(obj).length);

  
  
    
    
/*
run:
    
3
    
*/

 

70+ SQL courses for beginners and professionals