SyntaxFix

[javascript] Iterate through Nested JavaScript Objects

I made a pick method like lodash pick. It is not exactly good like lodash _.pick, but you can pick any property event any nested property.

  • You just have to pass your object as a first argument then an array of properties in which you want to get their value as a second argument.

for example:

let car = { name: 'BMW', meta: { model: 2018, color: 'white'};
pick(car,['name','model']) // Output will be {name: 'BMW', model: 2018}

Code :

const pick = (object, props) => {
  let newObject = {};
  if (isObjectEmpty(object)) return {}; // Object.keys(object).length <= 0;

  for (let i = 0; i < props.length; i++) {
    Object.keys(object).forEach(key => {
      if (key === props[i] && object.hasOwnProperty(props[i])) {
        newObject[key] = object[key];
      } else if (typeof object[key] === "object") {
        Object.assign(newObject, pick(object[key], [props[i]]));
      }
    });
  }
  return newObject;
};

function isObjectEmpty(obj) {
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) return false;
  }
  return true;
}
export default pick;

and here is the link to live example with unit tests

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