Don’t use flags as function parameters

☑️ Topic: Functions

☑️ Idea: Flags tell you that a function does more than one thing. Functions should do only one thing.

☑️ Benefits: Readability, reusability, testability

☑️ Guideline: If you find different code paths in a function based on a Boolean parameter, create 2 functions instead.


// BAD
function createFile(name, temp) {
  if (temp) {
    fs.create(`./temp/${name}`);
  } else {
    fs.create(name);
  }
}


// GOOD
function createFile(name) {
  fs.create(name);
}
function createTempFile(name) {
  createFile(`./temp/${name}`);
}