Declarative JavaScript concepts and implemetation

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The document discusses functional programming in JavaScript, emphasizing the use of functions to transform values and create software systems. It highlights concepts like pure and impure functions, closures, and functional techniques such as mapping and reducing. Additionally, it suggests libraries and tools supporting declarative programming styles in JavaScript.

Technology

${ Functional programming in JavaScript … and the curious case of _.js Om Shankar JavaScripter @ InMobi bit.ly/omshankar$

Functional programming is the use of functions that
transform values into units of abstraction, subsequently
used to build software systems.

Do Something !
– by doing this, and then that,
– and don’t forget to do this at the end of all that.

Get Something Done !
– I don’t care how you do it,
– also, when I want it done again, it should be as easy as it was the first
time.

Declarative programming: stackoverflow.com/a/8357604/1249219

Closures

Flow and Chaining

Recursion

{

Functions constructing Functions

The building blocks of Functional JavaScript

Mutation policies
Functions passed as parameters
Class-less JavaScript

• Should travel in First Class
• Should be Pure, hence, should be re-usable
• Should be Applicative
- function A supplied to B should perform actions in B’s context.

Strings are first class in JS,
- so are functions with all possible operations
// Both can be stored
var string = "BangaloreJS";
var stringFn = function() { return "BangaloreJS"; }
// can be used on the fly, as an expression:
// string
"BangaloreJS";
"BangaloreJS".slice(3);
// function
"BangaloreJS" + (function(){ return " Rocks !!"; }());

A pure function
•
•
•
•

takes argument(s)
returns value(s)
returns same value(s) for same argument(s)
does nothing else !

Arguments

Return value

An impure function
• takes argument(s)
• returns value(s)
• reads/writes external states, for
eg., modifies global DOM, objects, arrays.
Read State
Arguments

Return value
tightly coupled with read state

Change State

_. map
reduce / reduceRight
find / detect / where
filter / reject
every / some
...

_.bind(scopeObject, normalFn);
_.bindAll(obj, fn1, [fn2, fn3, ...]);

• Creating a complement function
• Creating a repeater function

$Functions taking functions as parameters function repeat(times, fn) { return _.map(_.range(times), fn); }$

$Functions returning functions as value var numData = [1,2,null,4,5]; _.reduce(numData, function(tot, curr) { return tot * curr; }); // Problem? // Solution: function returning modified safe function // and not imperatively modified data // though what we actually do is modify data on the fly$

RxJS
- Reactive extensions for JS by Microsoft

{

Declarative JavaScript Libraries

Bilby.js - bilby.brianmckenna.org
Allong.es - github.com/fogus/lemonad

CoffeScript - coffeescript.org

{

Declarative JavaScript Compilers

ClojureScript - github.com/clojure/clojurescript

ROY - bilby.brianmckenna.org

$@om_invincible { geekyogi.com End of Part - 1 Happy JavaScript-ing github.com/OmShiv bit.ly/omshankar$

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