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const COST_OF_ITEM = 15
// We use this immediately invoked anonymous function
// to create a private, non global scope (usually called a module).
// Anything that we want exposed publicly must be included in the
// returned object. This pattern is sometimes called
// "revealing modules"
let CartModule = (function() {
let moduleScopeVariable = 'super secret'
// Globally private function, never returned from module
function sideEffects() {
console.log('doing side effects')
}
// we make this public by adding it to
// the return object below
function removeFromCart(item) {
sideEffects()
console.log(`${item} removed from cart`)
return -COST_OF_ITEM
}
return {
// we define this function in the public return object,
// so it's public by definition
addToCart: function(item) {
console.log(`${item} added to cart`)
return COST_OF_ITEM
},
removeFromCart
}
})()
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