// https://stackoverflow.com/a/14706877/860099
function A(x) {
  return x === Object(x);
};

// https://stackoverflow.com/a/42250981/860099
function B(x) {
    return _.isObject(x);
}

// https://stackoverflow.com/a/34864175/860099
function C(x) {
    return x != null && (typeof x === 'object' || typeof x === 'function');
}

// https://stackoverflow.com/a/39187058/860099
function D(x) { 
  return new function() { return x; }() === x;
}

// https://stackoverflow.com/a/39187058/860099
function E(x) { 
  return function() { return this === x; }.call(x);
}

// https://stackoverflow.com/a/39187058/860099
function F(x) { /* Requires ECMAScript 5 or later */
  try {
    Object.create(x);
    return x !== null;
  } catch(err) {
    return false;
  }
}

// https://stackoverflow.com/a/39187058/860099
function G(x) { /* Requires ECMAScript 5 or later */
  function Constructor() {}
  Constructor.prototype = x;
  return Object.getPrototypeOf(new Constructor()) === x;
}

// https://stackoverflow.com/a/8511332/860099
function H(x) {
  return typeof x === 'object' && x !== null
}

// https://stackoverflow.com/a/25715455/860099
function I(x) {
  return (typeof x === "object" && !Array.isArray(x) && x !== null);
};

// https://stackoverflow.com/a/22482737/860099
function J(x) {
  return x instanceof Object; 
}

// https://stackoverflow.com/a/50712057/860099
function K(x)
{
    let t= JSON.stringify(x);
    return t ? t[0] === '{' : false;
}

// https://stackoverflow.com/a/13356338/860099
function L(x) {
  return Object.prototype.toString.call(x) === "[object Object]";
};



// https://stackoverflow.com/a/46663081/860099
function M(o, strict = true) {
  if (o === null || o === undefined) {
    return false;
  }
  const instanceOfObject = o instanceof Object;
  const typeOfObject = typeof o === 'object';
  const constructorUndefined = o.constructor === undefined;
  const constructorObject = o.constructor === Object;
  const typeOfConstructorObject = typeof o.constructor === 'function';
  let r;
  if (strict === true) {
    r = (instanceOfObject || typeOfObject) && (constructorUndefined || constructorObject);
  } else {
    r = (constructorUndefined || typeOfConstructorObject);
  }
  return r;
}

// https://stackoverflow.com/a/42250981/860099
function N(x) {
    return $.type(x) === 'object';
}

// https://stackoverflow.com/a/34864175/860099
function O(x) {
    if (Object.prototype.toString.call(x) !== '[object Object]') {
        return false;
    } else {
        var prototype = Object.getPrototypeOf(x);
        return prototype === null || prototype === Object.prototype;
    }
}

// https://stackoverflow.com/a/57863169/860099
function P(x) {
  while (     Object.prototype.toString.call(x) === '[object Object]')
  if    ((x = Object.getPrototypeOf(x))         === null)
  return true
  return false
}

// https://stackoverflow.com/a/43289971/860099
function Q(x){
  try{
    switch(x.constructor){
      case Number:
      case Function:
      case Boolean:
      case Symbol:
      case Date:
      case String:
      case RegExp:
        return x.constructor === Object;
      case Error:
      case EvalError:
      case RangeError:
      case ReferenceError:
      case SyntaxError:
      case TypeError:
      case URIError:
        return (Object === Error ? Error : x.constructor) === Object;
      case Array:
      case Int8Array:
      case Uint8Array:
      case Uint8ClampedArray:
      case Int16Array:
      case Uint16Array:
      case Int32Array:
      case Uint32Array:
      case Float32Array:
      case Float64Array:
        return (Object === Array ? Array : x.constructor) === Object;
      case Object:
      default:
        return (Object === Object ? Object : x.constructor) === Object;
    }
  } catch(ex){
    return x == Object;   
  }
}

// https://stackoverflow.com/a/52478680/860099
function R(x) {
    return typeof x == 'object' && x instanceof Object && !(x instanceof Array);
}

// https://stackoverflow.com/a/51458052/860099
function S(x)
{
    return x != null && x.constructor?.name === "Object"
}

// https://stackoverflow.com/a/42250981/860099
function T(x) {
    return x?.constructor?.toString().indexOf("Object") > -1;
}

// https://stackoverflow.com/a/43223661/860099
function U(x)
{
    return x?.constructor === Object;
}

// https://stackoverflow.com/a/46663081/860099
function V(x) {
  return x instanceof Object && x.constructor === Object;
}




// -------------
// TEST
// -------------

console.log('column: 1 2 3 4 5 6 - 7 8 9 10 11');

[A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V]
.map(f=> console.log(`${f.name}:      ${1*f(new Date())} ${1*f(/./)} ${1*f({})} ${1*f(Object.prototype)} ${1*f(Object.create(null))} ${1*f(()=>{})} - ${1*f("abc")} ${1*f(3)} ${1*f(true)}  ${1*f(null)}  ${1*f(undefined)}`))

console.log(`
Columns legend (test cases):
 1: new Date()
 2: /./ (RegExp)
 3: {}
 4: Object.prototype
 5: Object.create(null)
 6: ()=>{} (function)
 7: "abc" (string)
 8: 3 (number)
 9: true (boolean)
10: null
11: undefined

Rows:
1 = is object
0 = is NOT object

Theoretically columns 1-6 should have have 1, columns 7-11 shoud have 0
`);

<script
  src="https://code.jquery.com/jquery-3.5.1.min.js"
  integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0="
  crossorigin="anonymous"></script>
  
<script 
  src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js" 
  integrity="sha512-90vH1Z83AJY9DmlWa8WkjkV79yfS2n2Oxhsi2dZbIv0nC4E6m5AbH8Nh156kkM7JePmqD6tcZsfad1ueoaovww==" 
  crossorigin="anonymous"></script>
  
This shippet only presents functions used in performance tests - it not perform tests itself!