Array.reduce in Javascript - blog post

array-reduce-empty.js

[].reduce(function(a, b){
  return a + b;
});

array-reduce-initialValueSample.js

[].reduce(function(a, b){
  return a + b;
});

array-reduce-min.js

var arr = [7, 4, 9, 2, 11];
var min = arr.reduce(function(a, b){
  return Math.min(a, b);
});

array-reduce-signature.js

reduce (callback, [valorInicial])

array-reduce-total.js

var carrinho = [
  {"_id": "xht1", "item" : "Adaptador", "value": 3.5},
  {"_id": "cf12", "item" : "Cabo USB", "value": 11.2},
  {"_id": "ldi8", "item" : "Lâmpada LED", "value": 17.00}
];

var total = carrinho.reduce(function(acumulador, item){
  return acumulador + item.value;
}, 0);