What are object keys and values in programming?

What are object keys and values in programming?

In programming, especially in languages like JavaScript, an object is a collection of key-value pairs. The keys are strings that represent the property names, and the values can be any data type.

Can you give me an example of an object with keys and values?

Sure! Here's an example: const person = { name: 'Alice', age: 25, city: 'New York' }; In this object, 'name', 'age', and 'city' are keys, and 'Alice', 25, and 'New York' are their corresponding values.

How do I access the values in an object?

You can access the values using dot notation or bracket notation. For example, person.name or person['age'] will give you 'Alice' and 25, respectively.

What happens if I try to access a key that doesn't exist?

If you try to access a key that doesn't exist, it will return undefined. For example, person.country will return undefined since 'country' is not a key in the object.