Returns the value at the provided key path starting at the provided collection, or notSetValue if the key path is not defined.
getIn(collection: unknown,
keyPath: Iterable<unknown>,
notSetValue?: unknown): unknown
A functional alternative to collection.getIn(keypath) which will also
work with plain Objects and Arrays.
const { getIn } = require('immutable')
getIn({ x: { y: { z: 123 }}}, ['x', 'y', 'z']) // 123
getIn({ x: { y: { z: 123 }}}, ['x', 'q', 'p'], 'ifNotSet') // 'ifNotSet'run it