How Can I Create a Subset of a JavaScript Object Using Property Shorthand?

Subsetting JavaScript Objects with Property Shorthand

In JavaScript, objects provide a convenient way to store and organize data with key-value pairs. However, there may be situations where you need to create a new object with only a subset of the original object's properties.

Problem:

Consider the following object:

elmo = { 
  color: 'red',
  annoying: true,
  height: 'unknown',
  meta: { one: '1', two: '2'}
};

You wish to create a new object that contains only a specific subset of these properties, such as color and height.

Solution:

Object destructuring and property shorthand provide an elegant method to achieve this:

const subset = { ...elmo, color, height };

This syntax creates a new object, subset, that includes only the properties color and height from the original elmo object. The ...elmo spread operator copies over all other properties from elmo, while the color and height properties explicitly defined with property shorthand override the copied values.

Example:

const object = { a: 5, b: 6, c: 7  };
const picked = (({ a, c }) => ({ a, c }))(object);

console.log(picked); // { a: 5, c: 7 }

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