How to perform filter in java script objects?

Question

How to filter javascript objects based on a condition?

I tried this, but still it fills the remaining index of the object as null, I don't want the part of object if it doesn't meet my condition,here the condition is only if the index of the object is less the selectedIndex (which is some value in my program) it should be selected, remaining are not required

console.log(Object.keys(registrationData).map((val,ind)=>{
            return (ind<=selectedIndex ) ? registrationData[val] :null
   }));

Answer 1

Try this

Object
  .values(registrationData)
  .filter((value, index) => index <= selectedIndex)