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How to Fix 'Undefined Variable' Error in JavaScript?

I’m working on a JavaScript project, and I’ve encountered an issue with an "undefined variable" error. Here is the relevant part of my code:

function calculateSum(a, b) {
    return a + b + c;
 }
 let result = calculateSum(5, 10);
 console.log(result);

When I run this code, I get the following error in the console:

Uncaught ReferenceError: c is not defined
at calculateSum (script.js:2)
at script.js:5

I understand that the error is because c is not defined, but I’m not sure how to fix it. Could someone explain what I need to do to resolve this error?

I’ve checked the variable names to make sure there are no typos.
I’ve tried declaring c inside the function, but I need it to be dynamic based on some conditions.
Any help or suggestions would be appreciated. Thanks!

Tags:

2

Answers


  1. 0

    Well, based on the snippet you’ve shared variable c isn’t defined anywhere. Your function takes a and b as an input. However, you are returning a+b+c.

    Add c to the function definition and it’ll be fixed. Like below

        function calculateSum(a, b, c) {
           return a + b + c;
     }
    let result = calculateSum(5, 10, 5);
    console.log(result);

    If you want c to be dynamic, you may assign default value to c in function definition like this

        function calculateSum(a, b, c = 0) {
           return a + b + c;
     }
    let result = calculateSum(5, 10);
    console.log(result);
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  2. 0

    The error you’re encountering, Uncaught ReferenceError: c is not defined, occurs because you’re trying to use the variable c inside the calculateSum function without it being defined.

    There are some suggestions please try out them.

    first one you can pass the c as a parameter

    function calculateSum(a, b, c) {  
    return a + b + c;  
}  

let dynamicC = 3; // You can set this based on your conditions  
let result = calculateSum(5, 10, dynamicC);  
console.log(result);

    second is you can declare c inside the function

    function calculateSum(a, b) {  
    let c; // Declare c  
    // Set c based on any conditions you have  
    
    return a + b + c;  
}  

let result = calculateSum(5, 10);  
console.log(result); // Output will depend on the condition

    the third one is you can put c variable as a global variable

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