Weirdness with JS closures (Lua behaves differently).

gistfile1.txt

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

yeah, so long story short, block scoping makes the world sane and python and javascript are inferior for not having it. that's my conclusion to all this :)