jkeefe

Preparing a Pi

My Mac is too old to use the Raspberry Pi Imager.

So intstead I ...

• go to the downloads page and download the "Raspberry Pi OS" version (as opposed to the "Full" or "Lite" versions — just my preference).
• use balenaEtcher to image a Mini SD card. The card should be an "A2" version, and I like to use 64GB.
• use a USB keyboard and HDMI monitor to set up:
• Wifi network and password (set on first bootup)

jkeefe

# example: get rid of large `.tif` and `.nc` files in gis/tmp
# from https://www.geeksforgeeks.org/how-to-remove-a-large-file-from-commit-history-in-git/

git filter-branch --force --index-filter \
'git rm --cached --ignore-unmatch gis/tmp/*.tif' \
--prune-empty --tag-name-filter cat -- --all

git filter-branch --force --index-filter \
'git rm --cached --ignore-unmatch gis/tmp/*.nc' \
--prune-empty --tag-name-filter cat -- --all

jkeefe

// from https://github.com/iamkun/dayjs/issues/1619#issuecomment-1185714859

const round: PluginFunc = (option, dayjsClass) => {
  dayjsClass.prototype.round = function (amount, unit) {
    const mod = this.get(unit as UnitType) % amount;

    if(mod < amount / 2) {
      return this.subtract(mod, unit).startOf(unit);
    }

jkeefe

// npm install mapshaper --save

import mapshaper from 'mapshaper'

// Example of runCommands: converting a directory of Shapefiles to GeoJSON
mapshaper.runCommands('-i shapefiles/*.shp -o geojson/ format=geojson');

// ----

// Example of applyCommands: processing a json array

jkeefe

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets"
            ],
            "Resource": "arn:aws:s3:::*"
        },

jkeefe

[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "GET",
            "HEAD"
        ],
        "AllowedOrigins": [

jkeefe

function delay(time) {
    return new Promise(resolve => setTimeout(resolve, time));
}

// usage:

console.log("Thing one")
await delay(2000)
console.log("Thing two, two seconds later")

jkeefe

// based on: https://stackoverflow.com/a/67136959

const niceRounder = (number) => {

    let near = 1
    if (number > 100) near = 10
    if (number > 1000) near = 100
    if (number > 10000) near = 1000

    if (number % near === 0) return number;

jkeefe

[{"name":"Alabama","nyt":"Ala.","postal":"AL"},
{"name":"Alaska","nyt":"Alaska","postal":"AK"},
{"name":"Arizona","nyt":"Ariz.","postal":"AZ"},
{"name":"Arkansas","nyt":"Ark.","postal":"AR"},
{"name":"California","nyt":"Calif.","postal":"CA"},
{"name":"Colorado","nyt":"Colo.","postal":"CO"},
{"name":"Connecticut","nyt":"Conn.","postal":"CT"},
{"name":"Delaware","nyt":"Del.","postal":"DE"},
{"name":"District of Columbia","nyt":"D.C.","postal":"DC"},
{"name":"Florida","nyt":"Fla.","postal":"FL"},

jkeefe

const time_hash = Date.now().toString(36);

// reverse it for more wordiness:
const time_hash2 = Date.now().toString(36).split("").reverse().join("")