var log = (s,f) => console.log(`${s} --> {}:${f({})} {k:2}:${f({k:2})}`);
function A(obj) {
for(var i in obj) return false;
return true;
}
function B(obj) {
return JSON.stringify(obj) === '{}';
}
function C(obj) {
return Object.keys(obj).length === 0;
}
function D(obj) {
return Object.entries(obj).length === 0;
}
function E(obj) {
return Object.getOwnPropertyNames(obj).length === 0;
}
function F(obj) {
return Object.keys(obj).length === 0 && obj.constructor === Object;
}
function G(obj) {
return typeof obj === "undefined" || !Boolean(Object.keys(obj)[0]);
}
function H(obj) {
return Object.entries(obj).length === 0 && obj.constructor === Object;
}
function I(obj) {
return Object.values( obj ).every( val => typeof val === "undefined" );
}
function J(obj) {
for (const key in obj) {
if (hasOwnProperty.call(obj, key)) {
return false
}
}
return true;
}
function K(obj) {
for(var prop in obj) {
if(obj.hasOwnProperty(prop)) {
return false;
}
}
return JSON.stringify(obj) == JSON.stringify({});
}
function L(obj) {
for(var prop in obj) {
if(obj.hasOwnProperty(prop))
return false;
}
return true;
}
function M(obj) {
for (var k in obj)
{
if ( obj.hasOwnProperty(k) )
{
return false;
}
}
return true;
}
function N(obj) {
return Object.getOwnPropertyNames(obj).length === 0 &&
Object.getOwnPropertySymbols(obj).length === 0 &&
Object.getPrototypeOf(obj) === Object.prototype;
}
function O(obj) {
return !(Object.getOwnPropertyNames != undefined ? Object.getOwnPropertyNames(obj).length != 0 : (function(){for(var key in obj) break; return (key != null) && (key != undefined);})())
}
log('A',A);
log('B',B);
log('C',C);
log('D',D);
log('E',E);
log('F',F);
log('G',G);
log('H',H);
log('I',I);
log('J',J);
log('K',K);
log('L',L);
log('M',M);
log('N',N);
log('O',O);
