Mastering JavaScript Functional Programming

Stubbing

This is a use case similar in some aspects to polyfill: having a function do different work depending on the environment. The idea is to do stubbing, an idea from testing, which means replacing a function with another that does a simpler job, instead of doing the actual work.

A common case is the usage of logging functions. You may want the application to do detailed logging when in development, but not to say a peep when in production. A common solution would be writing something along the lines of:

let myLog = someText => {    if (DEVELOPMENT) {        console.log(someText); // or some other way of logging    } else {        // do nothing    }}

This works, but as in the example about Ajax detection, it does more work than it about Ajax detection, it ...