Binding functions to the 2nd argument

gistfile1.js

var numbers = ['10', '10', '10', '10'];
numbers.map(parseInt);
// [10, NaN, 2, 3]

var bind2nd = function (fn, val) {
  return function () {
    var newArgs = [arguments[0], val].concat(Array.prototype.slice.call(arguments, 1))
    return fn.apply(null, newArgs);
  }
};

var parseDecimalInt = bind2nd(parseInt, 10);
numbers.map(parseDecimalInt);
// [10, 10, 10, 10]