"RangeError: Invalid array length" when randomly choosing 4 rows out of 6 from the CSV file

[wakecarter]

Here are a couple of tips about that:

Wakefield's Daily Tips

ReferenceError: varName is not defined This is one of the most common errors in online experiments [image] It is also one of the easiest to solve. The issue is one of “scope”. To define a variable so it has scope across your whole experiment, all you have to do is assign it a value. Don’t edit your JavaScript to add “var” or “let” commands. To give your variable scope assign the value in a Begin Experiment code component tab outside any clauses (i.e. no Python indents). [image] I usually s…

Wakefield's Daily Tips

Use Auto → JS code components wherever possible Even if you aren’t planning to run your experiment online, using an Auto code component will help you spot syntax errors in your Python code. [image] There are some cases where valid Python code comes up as a Syntax error on the JavaScript side but these are rare and, when you encounter then, you can switch to a Both code component and edit or delete the JavaScript side to highlight the fact that they contain code that won’t run online unedited. …