How to Instantiate JavaScript Objects with Dynamic Class Names?
Oct 22, 2024 pm 01:59 PM
Instantiating JavaScript Objects with Dynamic Class Names
Creating JavaScript objects dynamically using a string variable to define the class name presents a unique challenge. Let's analyze the scenario you described and explore a potential solution.
In your pseudo code, you attempt to define a class with the variable name MyClass, store the class name in the string variable classNameString, and instantiate an object using that string as the class name.
This approach faces limitations in JavaScript's object instantiation mechanism, which requires a direct reference to the class constructor function. As you have stored the class name as a string, you cannot directly access the class constructor.
To workaround this issue, you can use an indirect approach:
<code class="javascript">var myObject = window[classNameString];</code>
In this code:
- window is the global object in JavaScript, which has a property for each defined class.
- The bracket notation [] is used to access the property corresponding to the classNameString.
- If a class with the name stored in classNameString exists, the code will retrieve and assign it to myObject.
By using this technique, you can dynamically instantiate objects using a string variable to define the class name. Remember that this approach assumes that the class is already defined and accessible through the global window object.
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