Object Methods | JavaScript 🔥 | Lecture 041
Summary
TLDRThe lecture discusses adding functions called methods to JavaScript objects, allowing objects to have capabilities beyond just storing data. Methods are created by assigning a function expression as an object property value. The 'this' keyword gives methods access to other data in the object. An example method called calcAge() calculates a person's age from their birth year. Another method getSummary() returns a string summarizing the person's data. This demonstrates that arrays are also objects that have built-in methods, foreshadowing more complex topics ahead about why arrays can have methods.
Takeaways
- 😀 Objects can contain functions as values, called methods
- 👍 Methods can access the object's properties using the 'this' keyword
- 💡 'this' refers to the object calling the method
- 📝 Methods can calculate and store data in the object for later use
- 🚦 Arrays are actually a special type of object with built-in methods
- 🔑 Writing methods keeps code DRY by avoiding repetition
- ✏️ Challenges help reinforce learning of new concepts
- 🎯 Object methods enable efficient data access and manipulation
- 🚀 There is an exciting programming journey ahead to dive deeper
- 🧠 Understanding function expressions enables writing methods
Q & A
What are object methods?
-Object methods are functions that are attached to an object. They are also called method properties on objects.
How do you add a method to an object in JavaScript?
-To add a method to an object, you define a function expression as the value for a property in the object. The property name is the name of the method and the function expression becomes the method definition.
What is the 'this' keyword in a method?
-The 'this' keyword in a method refers to the object on which the method is being called. So 'this' points to the object calling the method.
Why use the 'this' keyword instead of hard-coding the object name?
-Using the 'this' keyword allows the code to work automatically if the object name changes, following the DRY (Don't Repeat Yourself) principle by avoiding hard-coding the name.
How can an object method access other properties on the same object?
-By using the 'this' keyword, a method can access other properties defined on the same object, for example with 'this.propertyName'.
What are built-in array methods?
-Built-in array methods are functions that allow manipulation of arrays, like push(), pop(), shift(), unshift() etc. Arrays have these because arrays are also objects.
What is method chaining?
-Method chaining is calling one method after another sequentially by chaining them together with the dot notation, for example array.push().pop().
Should calculation logic go directly in object property values?
-No, any complex logic should go in methods instead, while property values can cache results, avoiding repeat calculations.
Why define a getSummary() method instead of a summary property?
-Defining a getSummary() method allows dynamically generating the summary string when needed, ensuring it stays up-to-date if properties change.
What is the main advantage of using OOP in JavaScript?
-The main advantage of OOP in JavaScript is better organization by grouping related properties and behaviors into objects, keeping code modular and reusable.
Outlines
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