JavaScript Techniques for Object Manipulation
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In the world of JavaScript, object methods are functions defined as properties of an object. You can call these methods using dot notation () or bracket notation. Methods often use the keyword to access or modify the object's own properties.
How to Define and Use Object Methods
You can define methods inside an object literal like this:
```js const myObj = { myMethod: function(params) { // Do something, e.g. access properties with this.prop },
// ES6 method shorthand myOtherMethod(params) { // Do something else } }; ```
Call the methods by:
If you define methods on a constructor's prototype, all instances share the method:
```js function Car(make, model, year) { this.make = make; this.model = model; this.year = year; }
Car.prototype.displayCar = function() { const result = ; console.log(result); };
const car1 = new Car('Honda', 'Accord', 2023); car1.displayCar(); // Calls the method, printing the string ```
Here, inside refers to the calling object () to access its properties.
Accessing Object Property Values
To access property values of an object (without knowing keys), use:
- Dot notation:
- Bracket notation:
- Get all values: returns an array of property values.
Example:
```js let obj = { language: "JavaScript", designedBy: "Brendan Eich", year: 1995 }; console.log(obj.language); // "JavaScript" console.log(obj["designedBy"]); // "Brendan Eich"
let values = Object.values(obj); console.log(values); // ["JavaScript", "Brendan Eich", 1995] ```
You can loop through these values easily.
Return Values of Methods
- Methods can return values using the statement.
- If no return is specified, the method returns by default.
- Returned values can be used or stored when calling the method.
Example with return:
```js const calculator = { add: function(a, b) { return a + b; } };
let sum = calculator.add(5, 7); // sum is 12 console.log(sum); ```
Summary Table
| Concept | How to Use | Example | |-----------------------|---------------------------------------------------|-------------------------------------------| | Defining a method | or in literal | | | Calling a method | | | | Access property values | or | or | | Get all property values| returns an array | | | Return value from method| Use inside method | in method |
This approach covers how to define, call, and use object methods, access their property values, and handle return values in JavaScript with clear examples.
The specific topic within Web Technologies is javascript-object. This article has been authored by Riara Wal.
- To create a more efficient search system using JavaScript, consider implementing a trie data structure. This technology can help find keys in an object quickly by storing a linked structure of nodes corresponding to each character of the keys.
- Incorporating technology like trie can significantly optimize object search operations in JavaScript, especially in real-world applications like autocomplete suggestions or spell-check solutions.
