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If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject(n) {
  return Object.prototype.toString.call(n) === '[object Object]';
}

If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject (n) {
  return Object.prototype.toString.call(n) === '[object Object]';
}

Or as a single-expression arrow function (ES6+)

const isObject = n => Object.prototype.toString.call(n) === '[object Object]'

If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject(n) {
  if (n == null) return false;
  return Object.prototype.toString.call(n) === '[object Object]';
}

If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject(n) {
  return Object.prototype.toString.call(n) === '[object Object]';
}

If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject(n) {
  if (n == null) return false;
  if (Object.prototype.toString.call(n) === '[object Object]') return true;
  return false;
}

If you would like to check if the prototype for an object solely comes from Object. Filters out String, Number, Array, Arguments, etc.

function isObject(n) {
  if (n == null) return false;
  return Object.prototype.toString.call(n) === '[object Object]';
}