Functional Progamming in Javascript: A checkCommander

jsbin.bacox.js

var slice = Array.prototype.slice;
// value to be checked:
var value = 1;
// limits
var max = 100;
var min = 10;
// checker to create checkCommand on a value
var checker = function (/* validators */) {
  var validators = slice.call(arguments);
  return function (val) {
    return validators.map(function (fn) {
       return fn(val); 
    }).every(function (state) {
      return state;
    }); 
  };
};
// validator: return a function with given params
var validator = function (fn) {
  return function () {
    var args = slice.call(arguments);
    return function () {
      return fn.apply(this, args.concat(slice.call(arguments)));
    };
  };
};
// definition of all validators
var isMin = validator(function (param, val) {
  return val >= param;
});
var isMax = validator(function (param, val) {
  return val <= param;
});
var isInRange = validator(function (min, max, val){
  return isMin(min)(val) && isMax(max)(val); 
});
var isNumeric = validator(function (val) {
  return !isNaN(parseFloat(val)) && isFinite(val); 
});
// actual magic the checkCommand:
var checkCommand = checker(isMin(min), isMax(max), isInRange(min, max), isNumeric());
console.log('checkCommand', checkCommand(value));

demo http://jsbin.com/bacox/2/edit