functions chain

gistfile1.js

function a(x) {
  console.log('a is called: ' + x);
  if (this.next) {
    this.next.call(null, 'aaa');
  }
}

function b(x) {
  console.log('b is called: ' + x);
  if (this.next) {
    this.next.call(null, 'bbb');
  }
}

function c(x) {
  console.log('c is called: ' + x);
  if (this.next) {
    this.next.call(null, 'ccc');
  }
}

function d(x) {
  console.log('d is called: ' + x);
  if (this.next) {
    this.next.call(null, 'ddd');
  }
}

function chain(functions) {
  return functions.reduceRight(function (next, curr) {
    return function () {
      var context = {
        next: next
      };
      curr.apply(context, arguments);
    }
  }); 
}

var functions = [a, b, c, d];
var f = chain(functions);
f('hoge');

console.log('done');

/* RESULT

a is called: hoge
b is called: aaa
c is called: bbb
d is called: ccc
done

*/