PetterRuud

map(['🐮','🍠', '🐔', '🌽'], cook);
=> ['🍔', '🍟', '🍗', '🍿'];

filter(['🍔', '🍟', '🍗', '🍿'],  isVegetarian);
=> ['🍟', '🍿'];

reduce(['🍔', '🍟', '🍗', '🍿'], eat);
=> ['💩'];

PetterRuud

[] + {} // "[object Object]" 
{} + [] // 0

var x = true, y = "42";
x == y; // false
y = 'true'
x == y // false

var a = { b: 42 };
var b = { b: 42 };