Category: Node

Hashmap Data Structure in Javascript, Example with Node.js

1/21/2013

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// Author: Arda Basoglu, ardabasoglu@gmail.com
// This example demonstrates the use of map like (like hash map in Java and dictionary in C#) data structure
// The code is tested with a machine Node.js installed
// If you have Node.js installed on your machine run the script by writing "node map.example.js" on the console
// create a map
var map = {};
// Add key, value pairs into the map with random strings
for (var i = 0; i < 500; i++) {
var item =generateRandomString();
var value = generateRandomString();
map[item] = value;
};
// Output every key, value pair onto the screen
for (var i in map) {
console.log("Key: " + i + ", Value: " + map[i]);
}
// The function required for generating random strings
function generateRandomString()
{
var randomString = "";
var randomStringSource = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for( var i=0; i < 5; i++ ){
randomString += randomStringSource.charAt(Math.floor(Math.random() * randomStringSource.length));
}
return randomString;
}

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error: The program ['pg_config'] is required

5/31/2012

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How to fix the installation problem of the module "pg" for Node in Mac OS X

Problem

When you issue npm install pg command to instal pg package for Node on your Mac OS X, you might get an error like this

"...error: The program ['pg_config'] is required"

Error simply implies that pg installation cannot find pg_config file.

Solution

1. First make sure you installed PostgreSQL.
2. Find the path to your pg_config file. In my case it is /Library/PostreSQL/8.4/bin/pg_config
3. Open the Terminal and enter the following commands one by one

PG_CONFIG=/Library/PostreSQL/8.4/bin/pg_config
export PG_CONFIG
npm install pg

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Hashmap Data Structure in Javascript, Example with Node.js

error: The program ['pg_config'] is required

How to fix the installation problem of the module "pg" for Node in Mac OS X

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