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typeof Object.prototype//'object'
typeof Date.prototype//'object'
typeof String.prototype//'object'
typeof Number.prototype//'object'
typeof Array.prototype//'object'
typeof Error.prototype//'object'
Note built-in objects have capital letters:
String
Number
Boolean
Object
Symbol
Null
Undefined
where Person = {
name:"noname",
age:0,
greet:function(){
console.log(`Hello${this.name}`);
}