gistfile1.md

NOTE: Scroll down for explanation (the difference turns out to be scoping, not closures per se).

$ cat juices.lua

local fruits = {"apple", "orange", "grape"}
local juicers = {}

for i,v in ipairs(fruits) do
    local fruit = v
    juicers[i] = function() return fruit .. " juice" end
end

print(juicers[1]());
print(juicers[2]());
print(juicers[3]());

$ lua juices.lua 

apple juice
orange juice
grape juice

$ cat juices.js

var fruits = ["apple", "orange", "grape"];
var juicers = [];

for (var i in fruits) {
    var fruit = fruits[i];
    juicers[i] = function() { return fruit + " juice"; }
}

console.log(juicers[0]());
console.log(juicers[1]());
console.log(juicers[2]());

$ node juices.js

grape juice
grape juice
grape juice