code: function pop(array) {
      return popTask;
  
      function popTask() {
        var value = Array.prototype.pop.call(array);
        return resolve(value);
      }
    }
docs: creates a promise-returning function which fetches the last value on the array.
  
  @class promisen
  @static
  @function pop
  @param array {Array|Array-like}
  @returns {Function} promise-returning function
  @example
  var promisen = require("promisen");
  
  var stack = ["foo", "bar"]; // stack is an array
  
  var task2 = promisen(promisen.pop(stack), task1);
  
  task2().then(function() {...}); // stack.length == 1