Inline Function

Goal

Trivial wrappers vanish; the call site reads as exactly what's happening.

Before the refactoring

function getRating(driver) {
  return moreThanFiveLateDeliveries(driver) ? 2 : 1;
}
function moreThanFiveLateDeliveries(driver) {
  return driver.numberOfLateDeliveries > 5;
}

After the refactoring

function getRating(driver) {
  return driver.numberOfLateDeliveries > 5 ? 2 : 1;
}

Savings

One fewer indirection to follow when reading; smaller surface to maintain.

Note

If the function had a meaningful name covering several call sites, inlining can scatter the intent — only inline when the body is as clear as the wrapper.