// Create a list hold 4 numbers
var list = array2list([1,2,3,4]);

// Generic multiplier function
var multiplier = val1 => val2 => val1 * val2;

// Functions to perform variety of numerical operations
var doubler = multiplier(2);
var tripler = multiplier(3);
var squarer = val => multiplier(val)(val);
var sqrter  = val => Math.sqrt(val);

list2array(MAP(doubler)(list));   // -> [2,4,6,8]
list2array(MAP(tripler)(list));   // -> [3,6,9,12]
list2array(MAP(squarer)(list));   // -> [1,4,9,16]
list2array(MAP(sqrter)(list));    // -> [1, 1.41421356237,
                                  //     1.73205080756, 2]