psenger

Tips and Tricks

how to find where the Configuration file is located

psql -U postgres -c 'SHOW config_file'

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// helps us in parsing the frontmatter from text content
const matter = require('gray-matter')
// helps us safely stringigy the frontmatter as a json object
const stringifyObject = require('stringify-object')
// helps us in getting the reading time for a given text
const readingTime = require('reading-time')

// please make sure you have installed these dependencies
// before proceeding further, or remove the require statements
// that you don't use

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pass

stores to a local db called ~/.password-store

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const minLength = (min) => (str) => (str||'').toString().trim().length >= min
const contains = (chars, min) => (str) => [...((str||'').toString().trim())].filter(char => (new Set(chars)).has(char)).length >= min
const hasLowerCase = contains('abcdefghijklmnopqrstuvwxyz', 1)
const hasUpperCase = contains('ABCDEFGHIJKLMNOPQRSTUVWXYZ', 1)
const hasNumber = contains('0123456789', 1)
const hasSpecialChar = contains('!@#$%^&*()-+_', 1)
const compose = (...fns) => (x) => fns.map((fn) => fn(x))
const passwordPolicyCheck = compose(
    minLength(12),
    hasLowerCase,

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Regular Expression to find all the CSS URL functions without quoted URLS

to find all url css commands that do not have quoted URLs

url\(([^"'\)]+)\)

• match case senstivie url(
• start capture group 1

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NextJS - when to use Client vs Server Components

Client	Server
Use React hooks such as useState, useEffect, useReducer	Fetch Data
Interactivity within the component, with event listeners (onClick())	Store sensitive information on server (tokens, API keys, etc.)
Use custom hooks that depend on state, effects.	Access backend resources directly
	Keep large dependencies on the server

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How to use different versions of Python on my mac

Why is it so hard to do Python on a mac... well its not so bad.

python3 -m venv myenv
source ./myenv/bin/activate
pip install Pipfile

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/**
 * Problem: an array of data, that has an array of sub data.
 * Three ways to do this:
 *  - map+split, reduce, push+spread, sort ( side effect: order is not retained )
 *  - map+split, flat
 *  - flatMap+split
 */
const values = 'a|b|c|d,e|f,g|h|i|j|k|l'

const A = values.split(',').map((v)=>v.split('|')).reduce((acc,v)=>{

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Apache Installation

yum install httpd -y

Default install directory /var/www/html

Apache Starting

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Curry

Currying is the process of turning a function that expects multiple parameters into one that, when supplied fewer parameters, returns a new function that awaits the remaining ones. [1]

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[1] https://fr.umio.us/favoring-curry/