add a property to an object in javascript

To add a property to an object in JavaScript, you can use dot notation or bracket notation. Here's an example using dot notation:

index.tsx
// Define an object
const obj = {
  name: 'John',
  age: 30
};

// Add a new property using dot notation
obj.city = 'New York';

console.log(obj); // { name: 'John', age: 30, city: 'New York' }
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In this example, we define an object obj with two properties: name and age. To add a new property called city, we simply use dot notation and assign a value to it ('New York' in this case).

Alternatively, you can use bracket notation to add a new property to an object:

index.tsx
// Define an object
const obj = {
  name: 'John',
  age: 30
};

// Add a new property using bracket notation
obj['city'] = 'New York';

console.log(obj); // { name: 'John', age: 30, city: 'New York' }
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In this example, we use bracket notation and the property name is enclosed in quotes. The effect is the same as when using dot notation.