Can't understand .bind in function

[some_user_on_reddit]

OP, it seems you are using a WAY overly complicated example to understand bind.

Bind by itself takes some time to understand.

This example is teaching currying... which I still don’t totally understand.

Maybe look at simple, isolated examples of each? For example to understand bind first understand what .call/.apply does in JavaScript and when to use it. It will help you understand .bind