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JavaScript cheatsheet

Processing a promise

Cloning a DOM object

let p = document.getElementById("para1")

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NASA POWER Cheatsheet

Table of contents

• Meteorology
• Radiation

Meteorology

Spatial resolution of 0.5 x 0.625 degrees of latitude and longitude respectively

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RPostgreSQL errors

RPostgreSQL package was not installed

Problem

You haven't installed the R package called RPostgreSQL. It will show the following error:

Error in library("RPostgreSQL") : there is no package called ‘RPostgreSQL’
Calls: source -> withVisible -> eval -> eval -> library
Execution halted

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FreeBSD Cheatsheet

Showing the OS

uname -sr

Showing the USB device list

usbconfig

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Zip and Unzip cheatsheet

Unzipping while ignoring the tree

unzip -j /path/to/file.zip -d output_folder

Unzipping while overwriting existing files

unzip -o /path/to/file.zip

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Node + Electron cheatsheet

Cloning an app

cd /path/to
git clone [email protected]:user/project.git
cd project
npm install electron --save-dev

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Creating ZIP files using PHP

<?php

/**
 * PREPARE THE PATHS AND FILE NAME
 *
 * Store the zip file to a common temporary location such as /tmp
 */

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CodeIgniter cheatsheet

CodeIgniter v3

A) Using multiple database connections

$writer = $this->load->database('write',TRUE);

$downloader = array(
 'field_a' => 'Value A',

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Converting a shapefile with multiple features into independent GeoJSON files

Usage

bash /path/to/shp2geojson.sh /path/to/input.shp unique_column /path/to/output-dir

Parameters

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ImageMagick Cheatsheet

Recoloring

convert grey.png -fill "#d7ccc8" -tint 100 brown.png
# or
convert grey.png -fill chocolate -tint 50 brown.png