[Spider]Swiftと同じfor-in型がJavascriptで書けます ref: http://qiita.com/iKichiemon/items/3fcb78d5da5af15ef1eb

file0.swift

let foods:[String] = ["apple", "fish", "meat"]

for food in foods {
    println(food)
}

// "apple"
// "fish"
// "meat"

file1.txt

var foods = ["apple", "fish", "meat"]

for food in foods {
    console.log(food)
}

// "apple"
// "fish"
// "meat"

file2.txt

for food, i in foods {
  console.log("I like \(foods[i]).");
};

// "apple"
// "fish"
// "meat"

file3.txt

var man:[String] = {
    "name" : "ken" ,
    "age" : 18,
    "address" : "Japan"
};

for key, value of man {
  console.log("\(key) : \(valu).");
}


// "name : ken"
// "age : 18"
// "address : Japan"

file4.txt

var lists = [ 1, 2, 3, 5, 6, 7, 8, 9, 10 ];
var doubles = [ value * 2 for value in lists ];

file5.txt

foods.forEach(function (food) {
    console.log(food);
}, this);