lib/modules/util.js
function type(input) {

  //If the input value is null, undefined or NaN the toStringTypes object shouldn't be used
  if (input === null || input === undefined || (input !== input && String(input) === "NaN")) {
    return String(input);
  }

  // use the typeMap to detect the type and fallback to object if the type wasn't found
  return typeMap[Object.prototype.toString.call(input)] || "object";
}
function type(input) {

  //If the input value is null, undefined or NaN the toStringTypes object shouldn't be used
  if (input === null || input === undefined || (input !== input && String(input) === "NaN")) {
    return String(input);
  }

  // use the typeMap to detect the type and fallback to object if the type wasn't found
  return typeMap[Object.prototype.toString.call(input)] || "object";
}
function type ( input ) { //If the input value is null, undefined or NaN the toStringTypes object shouldn't be used if ( input === null || input === undefined || ( input !== input && String ( input ) === "NaN" ) ) { return String ( input ) ; } // use the typeMap to detect the type and fallback to object if the type wasn't found return typeMap [ Object . prototype . toString . call ( input ) ] || "object" ; }
detect type using typeMap
detect type using typeMap