forEach for Objects, Arrays and NodeLists

each.js

const each = (data, fn) => {
	
	if (data==null) return false

	if ((data).constructor===Object) return Array.prototype.forEach.call(Object.keys(data), (key) => fn(data[key], key, data))
	else                             return Array.prototype.forEach.call(data, (item, i) => fn(item, i, data))

}

Examples:

// Array
each([0, 1, 2], (item, i, array) => console.log(item, i, array))

// NodeList
each(document.querySelectorAll('a'), (elem, i, array) => console.log(elem, i, nodelist))

// Object
each({ a: 1, b: 1, c: 1}, (item, key, obj) => console.log(item, i, obj))