revision:
Object.assign() : copies the values of all enumerable own properties from one or more source objects to a target object.
Object.create() : creates a new object with the specified prototype object and properties.
Object.defineProperties() : adds the named properties described by the given descriptors to an object.
Object.defineProperty() : adds the named property described by a given descriptor to an object.
Object.entries() : returns an array containing all of the [key, value] pairs of a given object's own enumerable string properties.
Object.freeze() : freezes an object. Other code cannot delete or change its properties.
Object.fromEntries() : returns a new object from an iterable of [key, value] pairs. (This is the reverse of Object.entries).
Object.getOwnPropertyDescriptor() : returns a property descriptor for a named property on an object.
Object.getOwnPropertyDescriptors() : returns an object containing all own property descriptors for an object.
Object.getOwnPropertyNames() : returns an array containing the names of all of the given object's own enumerable and non-enumerable properties.
Object.getOwnPropertySymbols() : returns an array of all symbol properties found directly upon a given object.
Object.getPrototypeOf() : returns the prototype (internal [[Prototype]] property) of the specified object.
Object.groupBy() : groups the elements of a given iterable according to the string values returned by a provided callback function. The returned object has separate properties for each group, containing arrays with the elements in the group.
Object.hasOwn() : returns true if the specified object has the indicated property as its own property, or false if the property is inherited or does not exist.
Object.is() : compares if two values are the same value. Equates all NaN values (which differs from both IsLooselyEqual used by == and IsStrictlyEqual used by ===).
Object.isExtensible() : determines if extending of an object is allowed.
Object.isFrozen() : determines if an object was frozen.
Object.isSealed() : determines if an object is sealed.
Object.keys() : returns an array containing the names of all of the given object's own enumerable string properties.
Object.preventExtensions() : prevents any extensions of an object.
Object.seal() : prevents other code from deleting properties of an object.
Object.setPrototypeOf() : sets the object's prototype (its internal [[Prototype]] property).
Object.values() : returns an array containing the values that correspond to all of a given object's own enumerable string properties.
<div>
<p id="object1"></p>
<p id="object2"></p>
<p id="object3"></p>
<p id="object4"></p>
<p id="object5"></p>
</div>
<script>
const object1 = {
name: 'John',
age: 20,
};
document.getElementById("object1").innerHTML = "keys(): " + JSON.stringify(Object.keys(object1));
document.getElementById("object2").innerHTML = "values(): " + JSON.stringify(Object.values(object1));
const personA = {
name: "Oscar",
introduction: function() {
document.getElementById("object3").innerHTML = "create() : " + `my name is ${this.name}`;
console.log("create(): " +`My name is ${this.name}`);
}
};
const me = Object.create(personA);
me.name = 'Theo';
me.introduction();
Object.freeze(personA);
personA.name = "Filip";
console.log("freeze(): ", personA.name)
document.getElementById("object4").innerHTML = "freeze() : " + personA.name;
const personB = {
name: "Filip",
age : 20
};
const obj2 = {
ishuman: true
}
Object.assign(personB, obj2);
console.log(personB);
document.getElementById("object5").innerHTML = "assign: " + JSON.stringify(personB);
</script>