programming-elixir-ch3-array.js

function doSomethingWith(array) {
  // do something with array here
}

let array = [1, 2, 3]; // In languages like JavaScript, arrays are mutable data structures where you can add and remove values without changing the reference to the underlying object.

doSomethingWith(array); // When doSomethingWith is passed the array as an argument, we pass it by reference. The implication here is that whatever happens inside of the function can mutate the underlying array.

console.log(array); // At this point, you don't actually know what to expect when you log the array - does it still have [1, 2, 3] or does it have other values?