Javascript Node Js basic to Advance
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// 1. Object.keys()
let sampleObject = { name: 'John', age: 30, city: 'New York' };
console.log(Object.keys(sampleObject));
// 2. Object.values()
let sampleObject = { name: 'John', age: 30, city: 'New York' };
console.log(Object.values(sampleObject));
// 3. Object.entries()
let sampleObject = { name: 'John', age: 30, city: 'New York' };
console.log(Object.entries(sampleObject));
// 4. Object.assign()
let obj1 = { a: 1, b: 2 };
let obj2 = { b: 4, c: 5 };
let mergedObject = Object.assign({}, obj1, obj2);
console.log(mergedObject);
// 5. Object.freeze()
let sampleObject = { name: 'John', age: 30 };
Object.freeze(sampleObject);
// Attempting to modify a frozen object will not work
// 6. Object.seal()
let sampleObject = { name: 'John', age: 30 };
Object.seal(sampleObject);
// Attempting to add/delete properties in a sealed object's descriptor will not work
// 7. Object.getOwnPropertyDescriptor()
let sampleObject = { name: 'John', age: 30 };
let descriptor = Object.getOwnPropertyDescriptor(sampleObject, 'age');
console.log(descriptor);
// 8. Object.getOwnPropertyNames()
let sampleObject = { name: 'John', age: 30 };
console.log(Object.getOwnPropertyNames(sampleObject));
// 9. Object.getPrototypeOf()
let sampleObject = {};
console.log(Object.getPrototypeOf(sampleObject));
// 10. Object.hasOwnProperty()
let sampleObject = { name: 'John', age: 30 };
console.log(sampleObject.hasOwnProperty('age'));
// 11. Object.create()
let sampleObject = { name: 'John', age: 30 };
let newObject = Object.create(sampleObject);
console.log(newObject);
// 12. Object.defineProperty()
let sampleObject = {};
Object.defineProperty(sampleObject, 'property1', {
value: 42,
writable: false
});
console.log(sampleObject.property1);
// 13. Object.defineProperties()
let sampleObject = {};
Object.defineProperties(sampleObject, {
property1: {
value: 42,
writable: true
},
property2: {
value: 'Hello',
writable: false
}
});
console.log(sampleObject.property1);
console.log(sampleObject.property2);
// 14. Object.getOwnPropertyDescriptors()
let sampleObject = { name: 'John', age: 30 };
let descriptors = Object.getOwnPropertyDescriptors(sampleObject);
console.log(descriptors);
// 15. Object.setPrototypeOf()
let sampleObject = {};
let prototypeObject = { prototypeProp: 'prototype' };
Object.setPrototypeOf(sampleObject, prototypeObject);
console.log(sampleObject.prototypeProp);
// 16. Object.is()
let value1 = 5;
let value2 = 5;
console.log(Object.is(value1, value2));
// 17. Object.entries()
let sampleObject = { a: 'Apple', b: 'Ball', c: 'Cat' };
let entries = Object.entries(sampleObject);
console.log(entries);
// 18. Object.fromEntries()
let entries = [['a', 1], ['b', 2], ['c', 3]];
let newObject = Object.fromEntries(entries);
console.log(newObject);
// 19. Object.values()
let sampleObject = { a: 'Apple', b: 'Ball', c: 'Cat' };
let values = Object.values(sampleObject);
console.log(values);
// 20. Object.keys()
let sampleObject = { a: 'Apple', b: 'Ball', c: 'Cat' };
let keys = Object.keys(sampleObject);
console.log(keys);
// 21. Object.preventExtensions()
let sampleObject = { name: 'John', age: 30 };
Object.preventExtensions(sampleObject);
// Prevents adding new properties to an object