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Apurav Chauhan apuravchauhan

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@kuldeepkeshwar
kuldeepkeshwar / for-of-loop.js
Last active May 19, 2018 07:37
implementing for-of loop
// implementation of "for of loop"
function forOf(iterable,callback){
var iterator = iterable[Symbol.iterator]();
var result=iterator.next();
var index=0;
while(!result.done){
callback(result.value,index);
result=iterator.next();
index++;
}
@apuravchauhan
apuravchauhan / country-dial-codes.json
Created February 3, 2018 06:23
Country List with Dial Codes
let countries =[
{ccode:"US",value:"1",name:"USA",mcode:"+1"},
{ccode:"GB",value:"44",name:"UK",mcode:"+44"},
{ccode:"DZ",value:"213",name:"Algeria",mcode:"+213"},
{ccode:"AD",value:"376",name:"Andorra",mcode:"+376"},
{ccode:"AO",value:"244",name:"Angola",mcode:"+244"},
{ccode:"AI",value:"1264",name:"Anguilla",mcode:"+1264"},
{ccode:"AG",value:"1268",name:"Antigua & Barbuda",mcode:"+1268"},
{ccode:"AR",value:"54",name:"Argentina",mcode:"+54"},
@markerikson
markerikson / connectExample.js
Last active March 5, 2024 01:24
React-Redux connect example
import {action1, action2} from "myActions";
import {bindActionCreators} from "redux";
import {connect} from "react-redux";
const mapStateToProps = (state, ownProps) = {
return {
counter : state.counter,
someComponentValue : state.things[ownProps.someIdProp]
};
}
@vasanthk
vasanthk / System Design.md
Last active July 6, 2024 18:35
System Design Cheatsheet

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?
@austinhyde
austinhyde / js-observables-binding.md
Last active August 16, 2023 18:19
Vanilla JavaScript Data Binding

Observables

You don't really need a framework or fancy cutting-edge JavaScript features to do two-way data binding. Let's start basic - first and foremost, you need a way to tell when data changes. Traditionally, this is done via an Observer pattern, but a full-blown implementation of that is a little clunky for nice, lightweight JavaScript. So, if native getters/setters are out, the only mechanism we have are accessors:

var n = 5;
function getN() { return n; }
function setN(newN) { n = newN; }

console.log(getN()); // 5

setN(10);

@mingfang
mingfang / JSXTransformer.java
Last active October 10, 2020 05:45
Java tool to transform React JSX into Javascript
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.NativeObject;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.commonjs.module.Require;
import org.mozilla.javascript.commonjs.module.RequireBuilder;
import org.mozilla.javascript.commonjs.module.provider.SoftCachingModuleScriptProvider;
import org.mozilla.javascript.commonjs.module.provider.UrlModuleSourceProvider;
import java.io.File;
@andyj
andyj / html_for_international_calling coes.htm
Created October 22, 2013 21:57
HTML <select> international calling codes for each country
<!-- country codes (ISO 3166) and Dial codes. -->
<select name="countryCode" id="">
<option data-countryCode="GB" value="44" Selected>UK (+44)</option>
<option data-countryCode="US" value="1">USA (+1)</option>
<optgroup label="Other countries">
<option data-countryCode="DZ" value="213">Algeria (+213)</option>
<option data-countryCode="AD" value="376">Andorra (+376)</option>
<option data-countryCode="AO" value="244">Angola (+244)</option>
<option data-countryCode="AI" value="1264">Anguilla (+1264)</option>
<option data-countryCode="AG" value="1268">Antigua &amp; Barbuda (+1268)</option>
@pitch-gist
pitch-gist / gist:2999707
Created June 26, 2012 22:21
HTML: Simple Maintenance Page
<!doctype html>
<title>Site Maintenance</title>
<style>
body { text-align: center; padding: 150px; }
h1 { font-size: 50px; }
body { font: 20px Helvetica, sans-serif; color: #333; }
article { display: block; text-align: left; width: 650px; margin: 0 auto; }
a { color: #dc8100; text-decoration: none; }
a:hover { color: #333; text-decoration: none; }
</style>
@jboner
jboner / latency.txt
Last active July 7, 2024 21:35
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@jessedearing
jessedearing / gist:2351836
Created April 10, 2012 14:44 — forked from twoism-dev/gist:1183437
Create self-signed SSL certificate for Nginx
#!/bin/bash
echo "Generating an SSL private key to sign your certificate..."
openssl genrsa -des3 -out myssl.key 1024
echo "Generating a Certificate Signing Request..."
openssl req -new -key myssl.key -out myssl.csr
echo "Removing passphrase from key (for nginx)..."
cp myssl.key myssl.key.org
openssl rsa -in myssl.key.org -out myssl.key