Function each

src/utils/each.js:3–12

(collection, callback)

import isObject from './is-object'

export default function each(collection, callback) {
	if (isObject(collection)) {
		const keys = Object.keys(collection)
		return keys.forEach(key => callback(collection[key], key, collection))
	}
	if (collection instanceof Array) {
		return collection.forEach((item, i) => callback(item, i, collection))
	}
	throw new TypeError('Expected either an array or object literal.')
}