Javascript - removing undefined fields from an object [duplicate]

Answer 1

Mhh.. I think @Damian asks for remove undefined field (property) from an JS object. Then, I would simply do :

for (const i in myObj)  
   if (typeof myObj[i] === 'undefined')   
     delete myObj[i]; 

Short and efficient solution, in (vanilla) JS ! Example :

const myObj = {
  a: 1,
  b: undefined,
  c: null, 
  d: 'hello world'
};

for (const i in myObj)  
  if (typeof myObj[i] === 'undefined')   
    delete myObj[i]; 

console.log(myObj);