30-seconds-of-code/snippets/forOwnRight.md

forOwnRight

Iterates over all own properties of an object in reverse, running a callback for each one.

Use Object.keys(obj) to get all the properties of the object, Array.reverse() to reverse their order and Array.forEach() to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.

const forOwnRight = (obj, fn) => Object.keys(obj).reverse().forEach(key => fn(obj[key],key,obj));

forOwnRight({foo: 'bar', a: 1}, v => console.log(v)); // 1, 'bar'