JsLambdaFun.js

function makeI(){return function(){};}
function makeII(s){return function(){console.log(s);};}

var xi1 = makeI();
var xi2 = makeI();

var xii1 = makeII('xii1');
var xii2 = makeII('xii2');

console.log(xi1 === xi2); //outputs false
console.log(xii1 === xii2); //outputs false

var t = {};

t[xi1] = "1";
t[xi2] = "2";
t[xii1] = "3";
t[xii2] = "4";

console.log(t[xi1]); //outputs 2
console.log(t[xi2]); //outputs 2
console.log(t[xii1]); //outputs 4
console.log(t[xii2]); //outputs 4

console.log(t[xi1] === t[xi2]); //outputs true
console.log(t[xii1] === t[xii2]); //outputs true