How to Retrieve All Methods of an Object in JavaScript?

How to Display All Methods of an Object

In JavaScript, obtaining all methods available for an object is a common task. Let's delve into the solution for achieving this:

Approach:

To list all methods of an object, you can utilize the Object.getOwnPropertyNames() method. This method retrieves an array of all property names belonging to an object, including methods and properties.

To filter out only the methods, you can utilize the filter() function as follows:

<code class="javaScript">const objectMethods = Object.getOwnPropertyNames(object).filter(property => typeof object[property] === 'function');</code>

Example:

Consider the Math object. By using the上述代码, you can obtain all its methods:

<code class="javaScript">console.log(Object.getOwnPropertyNames(Math).filter(property => typeof Math[property] === 'function'));</code>

This will print the following output:

[
  "abs", "acos", "asin", "atan", "atan2", "ceil", "cos", "exp", "floor",
  "log", "max", "min", "pow", "random", "round", "sin", "sqrt", "tan",
  ...
]

ES3 Browsers:

In ES3 browsers (such as IE 8 and lower), properties of built-in objects are not enumerable. However, objects like window and document are enumerable by design. This means you may encounter some limitations when trying to list methods of these built-in objects.

Note on Naming Conventions:

Be cautious when naming your object properties. If there is a built-in prototype property or method with the same name, IE may skip over it when using a for...in loop due to a bug related to the { DontEnum } attribute.

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