How to Dynamically Retrieve Local Variables by Name in JavaScript?

Dynamic Retrieval of Local Variables by Name in JavaScript

In JavaScript, accessing global variables by name is straightforward using the window object. But what about local variables defined within a specific script? Can they be accessed dynamically by their names?

One method involves taking advantage of the global scope:

//in one script
var someVarName_10 = 20;

//in another script
alert(window["someVarName_10"]); //alert 20

However, this approach may not be ideal as it relies on the variable being added to the global scope.

Another alternative is to utilize the eval() function:

//in one script
var num = 10;
alert(eval('someVarName_' + num)); //alert 20

This method evaluates the string expression and returns the value of the corresponding variable.

Note: It's important to consider potential security implications when using the eval() function.

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