picaq

let map = new Map();

const incrementMapVal = (map, key) => {
  const currentValue = map.has(key) ? map.get(key) : 0;
  map.set(key, currentValue + 1);
}

const decrementMapVal = (map, key) => {
  const currentValue = map.has(key) && map.get(key);
  currentValue > 1 ? map.set(key, currentValue - 1) : map.delete(key);

picaq

let randomize = list => console.log(list[Math.floor(list.length * Math.random())]); 

picaq

List 1:	Info 1
List 2:	Info 2
List 3:	Info 3

picaq

const getCityValues = async () => {
  try {
    const response = await fetch(
      `https://data.epa.gov/efservice/getEnvirofactsUVHourly/CITY/Seattle/STATE/WA/JSON`
    );
    const jsonData = await response.json();
    console.log(jsonData);  
  } catch (error) {
    console.error(error.message);
    console.error(userCity, 'is not found!');

picaq

const count = (str, subst)  => str.match( new RegExp(subst, "g") )?.length || 0;

picaq

// guide : https://www.freecodecamp.org/news/how-to-format-number-as-currency-in-javascript-one-line-of-code/

// format number to US dollar
let usd = new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency: 'USD',
});

let cad = new Intl.NumberFormat('en-CA', {
    style: 'currency',

picaq

Fine typography for the web

1. the easiest way to edit and update CSS is with the Stylus plugin to specify user styles
2. a js bookmarklet or snippet is used to inject quote classes for styling

• if no external chrome plugin is preferred, CSS can be injected with this bookmarklet
• chrome extension coming soon? maybe?

view the codepen here

picaq

const c2f = c => ( c * 9/5 ) + 32;
const f2c = f => ( f - 32 ) * 5/9;

const c2k = c =>  c + 273.15;
const k2c = k => k - 273.15;

const f2k = f => f2c(f) + 273.15;
const k2f = k => c2f(k - 273.15);

picaq

a.charCodeAt(0); // get char code int from str char
String.fromCharCode(...nums); // convert list of nums to string

// convert string to arr of char code nums
const charCodes = (string) => {
  let nums = [];
  for (i in string) nums.push(string.charCodeAt(i)); 
  return nums;
}

picaq

const bang = n => {
  if ( n < 2 ) return 1;
  let fact = 1, i = 2;
  while (i <= n) {fact*=i; i++};
  return fact;
}