krohne’s gists

krohne / decode_jwt.js

Created May 21, 2018 15:42

Decode Base64 JWT from login request in Postman

	const jsonData = JSON.parse(responseBody);
	const payload = jsonData.id_token.split('.')[1]; // Assuming the JWT is in id_token
	const parsed = JSON.parse(atob(payload));
	pm.environment.set('user_id', parsed.user_id); // Assuming user_id is in the payload

krohne / update_repos.sh

Last active May 21, 2018 13:02

Update collection of git repositories quickly in parallel

	#!/bin/bash
	# $1 - a folder containing multiple git repos; i.e. ~/work
	# The Mac way to get number of logical cores
	# You can run more parallel processes than the number of cores,
	# but at some point the process will slow to a crawl
	cores=$( sysctl -n hw.ncpu )
	# list all paths below $1 in single column, and pipe to xargs:
	# ls -d1 $1/*/ \|
	# Run a bash command on each path, using $cores number of processes:
	# xargs -I % -n 1 -P $cores bash --login -c

krohne / toDigits.js

Created March 14, 2018 22:32

Force string to numeric-only string that can be converted to integer by replacing non-digits with integer character code

	function toDigits (str = '') {
	// replace every (/g) non-digit (\D) with the character code (charCodeAt) for that non-digit.
	return str.replace(/\D/g, nondigit => nondigit.charCodeAt(0) );
	}

	console.log(toDigits('A1b2C3-4');

krohne / x100.js

Last active February 26, 2018 13:57

Multiply by 100 by string manipulation, to avoid floating point problems. Mostly for handling currency.

	function x100(nStr) {
	function replacer(match, p1, p2) {
	return `${`${p1}${p2.padEnd(2, '0').substr(0,2)}`.padStart(1, '0')}.${p2.padEnd(2, '0').substr(2)}`;
	}
	return String(nStr) // just in case
	.replace(/(\d)\.?(\d)/, replacer);
	}

	const tests = [
	'0.00',

krohne / countdown.sh

Last active December 27, 2024 06:58

Countdown timer in bash shell script

	#!/bin/bash
	# $1 = # of seconds
	# $@ = What to print after "Waiting n seconds"
	countdown() {
	secs=$1
	shift
	msg=$@
	while [ $secs -gt 0 ]
	do
	printf "\r\033[KWaiting %.d seconds $msg" $((secs--))

krohne / excludesTime.js

Created November 17, 2017 17:48

Check if time range excludes a time

	// You could play around with allowed inputs

	import Moment from 'moment';
	import { extendMoment } from 'moment-range';

	const moment = extendMoment(Moment);

	function excludesTime(start, end, when) {
	let startTime = moment(start, 'HH:mm');
	const endTime = moment(end, 'HH:mm');

krohne / randomDigits.js

Last active November 7, 2017 20:40

random decimal digits using Node crypto

	// Limited to max 16 digits
	function randomDigits(digits) {
	return parseInt(
	crypto
	.randomBytes(Math.floor(digits/2))
	.toString('hex')
	,16)
	.toString(10)
	.substr(-digits);
	}

krohne / yesterday.js

Created January 19, 2017 13:59

Yesterday's date in one line

return ( (new Date( new Date( (new Date()).toISOString().slice(0,10) ) - 1 ) ).toISOString().slice(0,10) );

krohne / downloadsize.js

Last active October 18, 2016 17:20

Nashorn Javascript CLI that will report the download size of a given URL as a command line parameter

	#!env jjs
	// jjs filesize.js -- config.txt
	// Sample config.txt:
	// http://unec.edu.az/application/uploads/2014/12/pdf-sample.pdf

	var Files = Java.type('java.nio.file.Files');
	var Paths = Java.type('java.nio.file.Paths');
	var URL = Java.type('java.net.URL');

	function getSize(url) {

krohne / evens.js

Created October 18, 2016 15:27

Given an array of n integers (example: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 112, 113] ), // remove all odd numbers, leaving only the even numbers.

	// given an array of n integers (example: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 112, 113] ),
	// remove all odd numbers, leaving only the even numbers.

	const x = [
	-Math.MAX_VALUE, -113, -112, -100, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, -Math.MIN_VALUE, -0,
	0, Math.MIN_VALUE, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 112, 113, Math.MAX_VALUE
	];
	console.log(x.filter( n => { return ( n % 2 === 0); }));

Gregory Krohne krohne