I've seen a slide that presented Fab, a node.js framework.
Is this JavaScript?
Could someone explain what is going on in that code?
I'm all lost.
Is plain JavaScript, it is a function chaining pattern.
The first line, ( fab = require("fab") )
includes the fab
function and returns a reference to it.
All the subsequent parentheses are function calls, each function invocation returns probably the same function again and again.
The pattern probably looks like this simplified example:
var foo = function (arg) {
// detect what the argument is
if (typeof arg == 'function') {
// do something with arg
console.log('function: '+arg());
} else if (arg instanceof RegExp) {
// arg is a RegExp...
console.log('A RegExp: '+arg);
} else if (typeof arg == "string") {
// arg is a string
console.log('A string: '+arg);
}
return foo; // return a reference to itself
};
(foo)
(function() { return "Foo "; })
(/bar/)
(" baz!");
Outputs:
function: Foo A RegExp: /bar/ A string: baz!