How Can I Dynamically Access Variables in JavaScript?

Getting Dynamic Variable References in JavaScript

In JavaScript, variables are stored within objects. For instance, in the global scope, variables are implicitly assigned to the window object. However, accessing variables dynamically through variable names can be tricky.

Variable Access Using Object Notation

To access a variable by its name, we can use object notation with the window object:

var name = window.a;

Alternatively, we can use bracket notation:

var name = window['a'];

This method only works for the global object since its variable object is the window object itself.

Accessing Variables in Function Contexts

Within functions, we lose direct access to the activation object where variables are stored. To retrieve a variable dynamically:

1. Use This: Non-arrow functions have their own this object, which stores function variables.

var name = this.a;

2. Use the Call Function: Arrow functions do not have their own this object. Call the function using the context of the object where the variable is defined.

var result = name.call(object, a);

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