Javascript: pass a function as a parameter to another function

function_as_parameter.js

// pass a function as a parameter of another function

function doAnotherThing() {
  console.log('Doing another thing…');
}

function doSomething(callback) {
  console.log('Doing something…');
  if (typeof callback == 'function') {
    callback.call();
  }  
}

doSomething(doAnotherThing);

// results in:
// Doing something…
// Doing another thing…