Functional programming

hof.js

function whosTopDog(dogs, comparison) {
  for (var i=0; i < dogs.length; i++) comparison(dogs[i]);
}
  
whosTopDog(['ice cube', '50 cent', 'snoop'], function(dog) {
  if(dog === 'snoop dog') {
    console.log(dog+ ' is top deg.');
  }
  else {
    console.log(dog+ ' is a bitch.');
  }
});

map-invoke.js

array = ['ice cube', '50 cent', 'snoop']

map(array, function(value, index) {
  return value+ ' has index: ' +index+ ' in the array.';
})

map.js

var map = function(items, fn) {
  var newArray = [];
  for(var i=0; i < items.length; i++) newArray.push(fn(items[i], i));
  return newArray;
}