aseemk

Keybase proof

I hereby claim:

• I am aseemk on github.
• I am aseemk (https://keybase.io/aseemk) on keybase.
• I have a public key whose fingerprint is 8FD7 03E6 42A7 B1CD 6D50 07F4 4929 0166 F879 0B95

To claim this, I am signing this object:

aseemk

Pattern 1: Pre-fetch the result, and cache it.

The result will hopefully already be available when needed, and the async call will be made only once.

fooFuture = fetchFoo !_

# anytime when needed:
foo = fooFuture _ # supports multiple calls!

aseemk

echo = console.log
Request = require 'request'

BASE_URL = 'http://localhost:7474'

# helper to make transactional requests:
req = (_, {query, params, commit, rollback, txId}) ->
    method = if rollback then 'DELETE' else 'POST'

    url = "#{BASE_URL}/db/data/transaction"

aseemk

$ node-streamline -c truthy_.js
$ node-streamline -c true_.js

/usr/lib/node/.npm/streamline/0.1.11/package/lib/transform.js:1549
			throw new Error(message);
         ^
Error: error streamlining source: Missing identifier on line 5
    at Object.transform (/usr/lib/node/.npm/streamline/0.1.11/package/lib/transform.js:1549:10)
    at /usr/lib/node/.npm/streamline/0.1.11/package/lib/compile.js:48:30
    at /usr/lib/node/.npm/streamline/0.1.11/package/lib/compile.js:43:206

aseemk

// streamline.options = { "callback": "_cb" }

var _ = require('underscore');
var array = [1, 2, 3];

function process(item, _cb) {
    // simulate async task
    setTimeout(_cb, 1000);
    return item;
}

aseemk

console.log('will throw error in one second...');

try {
    // simulate async step here:
    setTimeout(_, 1000);
    
    // then *synchronously* throw error here:
    (function closure() {
        throw new Error();
    })();

aseemk

// here's an example third-party, out-of-my-control function.
// it calls the callback with multiple non-error values:
function addAndProfile_original(x, y, callback) {
    var start = Date.now();
    return setTimeout(function () {
        var time = Date.now() - start;
        callback(null, x + y, time);
    }, 1000);
}

aseemk

coffee = require 'coffee-script'
streamline = require 'streamline'
fs = require('fs')

if require.extensions
    require.extensions['.coffee'] = (module, filename) ->
        content = coffee.compile fs.readFileSync filename, 'utf8'
        if filename.match /_\.coffee$/
            content = streamline.transform.transform content
        module._compile content, filename

aseemk

var express = require('express');
var app = express.createServer();

app.configure(function () {
    app.use(app.router);
});

app.set('views', __dirname + '/views');
app.set('view engine', 'html');
app.register('.html', require('eco'));

aseemk

var express = require('express');
var app = express.createServer();

app.configure(function () {
    app.use(require('./blocks')(app));
    app.use(app.router);
});

app.set('views', __dirname);
app.set('view engine', 'html');