30-seconds-of-code/snippets/get-native-type-of-value.md

Get native type of value

Returns lower-cased constructor name of value, "undefined" or "null" if value is undefined or null

const getType = v =>
  v === undefined ? "undefined" : v === null ? "null" : v.constructor.name.toLowerCase(); 
// getType(new Set([1,2,3])) -> "set"