Picking object properties
With Array.prototype.reduce(), we can extract only the properties of an object we want to pass along.
// we don’t want to pass all of this information along all the time
const user = {
email: 'ckent@dailyplanet.com',
password: 'i-am-superman',
username: 'clarkkent'
}
// this function receives an object and a list of properties to extract
const pick = (object, props) => props.reduce((picked, prop) => ({
...picked,
[prop]: object[prop]
}), {})
// we can use `pick` to get only the information we need
const condensedUser = pick(user, ['username', 'email'])
// ⇒ {
// username: 'clarkkent',
// email: 'ckent@dailyplanet.com'
// }