Javascript FAB framework on Node.js -

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i've seen slide presented fab, node.js framework.

fab slide

is javascript?

could explain going on in code?

i'm lost.

is plain javascript, function chaining pattern.

the first line, ( fab = require("fab") ) includes fab function , returns reference it.

all subsequent parentheses function calls, each function invocation returns same function again , again.

the pattern looks simplified example:

var foo = function (arg) {   // detect argument   if (typeof arg == 'function') {     // arg     console.log('function: '+arg());   } else if (arg instanceof regexp) {     // arg regexp...     console.log('a regexp: '+arg);   } else if (typeof arg == "string") {     // arg string     console.log('a string: '+arg);   }   return foo; // return reference };  (foo)   (function() { return "foo "; })   (/bar/)   (" baz!");

outputs:

 function: foo regexp: /bar/ string: baz!

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