Detecting Null Values

Recently, I encountered an issue with a Javascript function I created. Despite my efforts, I was not getting the desired result. The purpose of the function is to check various variables for null values and replace them with blank spaces when necessary. Here is the code snippet:

function chkNull(myObject) { 
   if (myObject == null){
       myObject = " ";
   }
}

After defining the function, I proceeded to test it using the following code:

var dOb = null;
chkNull(dOb);

Despite my best attempts, something seems to be amiss. Interestingly, when I perform the null check directly after declaring the 'dOb' variable, it works as expected.

Answer №1

Make sure to always return a valid value

function validateValue(input) {
    if (input == null) {
        return " ";
    } else {
        return input;
    }
}

And implement it like this:

let finalValue = validateValue(maybeNull);

Using the function in an example:

let sample = null;
sample = validateValue(sample);

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