Can someone assist me with troubleshooting my issue of using a for loop to iterate through an array during a function call

Having recently delved into the world of Javascript, I've encountered a challenging problem that has consumed my entire day. Despite attempting to resolve it on my own, I find myself feeling quite stuck.

The structure of my code is relatively simple - I've crafted 5 distinct functions. One function checks for letters, another for numbers, one identifies an open bracket, and the fourth spots a closed bracket. The fifth function is designed to detect full stops. Each of these functions returns a true value.

Next, I created a master function that calls upon these individual functions as needed to generate a numerical output based on the content found within a text string.

At the core of this issue lies a particular line of code:

identity = isWhat(ModCompound[x], ModCompound[y]);

Strangely, removing this line causes the loop to proceed without any hiccups. What could be the underlying mistake causing the crash?

Here's a snippet of the raw code:


    <!DOCTYPE html>
<!--
Sjb 19/03/2015
-->
<html>
    <head>
        <title></title>
    </head>
    <body>

        Chemicals
</br>

    Compound: <input id="compound" value="NaCl.2(H20)">


<script>
    var identity;
    var x;
    Compound = document.getElementById('compound').value;

    ModCompound = Compound;
    ModCompound = ModCompound.split('');

    for (i = 0; i < Compound.length; i++){
        x = i;
        y = i;
        document.write(i);
        identity = isWhat(ModCompound[x], ModCompound[y]);

        document.write(Math.random() + "   : " + identity + "</p>");

    }    

      ModCompound= ModCompound.join('');

    // Custom Functions
        // Function definitions here

  </script>

    </body>
</html>

Answer №1

When you are using return statements, remember to keep it simple:

return 1;

A common mistake is doing this:

return isWhat = 1;

This code sets the variable isWhat to 1, and then returns it. However, isWhat should be a function, not a number, so setting it to 1 will prevent you from calling it as a function. Also, there is no need for var===true, because if var is true, it will automatically evaluate to true in an if statement.

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