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

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

const forOwn = (obj, fn) =>
Object.keys(obj).forEach((key) => fn(obj[key], key, obj));
forOwn({ foo: "bar", a: 1 }, (v) => console.log(v)); // 'bar', 1