• assign

assign

>>let x={a:11,b:22};
>>let y={b:33,c:44};
>>let z={};
>>Object.assign(z,x,y);

>>z
Object { a: 11, b: 33, c: 44 }
>>z.toString()
"[object Object]" 
>>z["toString"]=()=>{return `a=${z.a},b=${z.b}`};
function toString()

>>z.toString()
"a=11,b=33"