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function rgbToHex([red = 0, green = 0, blue = 0] = []) {
	// Left shift (<<)  operator for color conversion is interesting
	// the color value for each component of an RGB color is between 0 - 255 (8bits)
	// The first 8 bits starting from the right will represent the blue component, 
	// the next 8 bits will represent the green component, and the 8 bits after that will represent the red component
	return `#${(red << 16 | green << 8 | blue).toString(16)}`;
}
function hexToRgb(hex) {
	// working through above shift operator procedure backwards
	// we will right-shift the color bits by multiples of 8 as necessary until

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function maskify(creditCard) {
	if (creditCard.length < 6) return creditCard;
	const last4Characters = creditCard.substr(-4);
	const firstCharacter = creditCard.substr(0, 1);
	const maskingCharacters = creditCard.substr(1, creditCard.length - 5).replace(/\d/g, '#');
	return `${firstCharacter}${maskingCharacters}${last4Characters}`;
}

// let assert = require('chai').assert
// require('mocha').describe;

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const setTimeouts = [];
export function customSetTimeout(cb, interval) {
  const now = window.performance.now();
  const index = setTimeouts.length;
  setTimeouts[index] = () => {
    cb();
  };
  setTimeouts[index].active = true;
  const handleMessage = (evt) => {
    if (evt.data === index) {

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function longest_symm_substr(s) {
    let longest_symmetric = '';
  	for(let i=0;i<s.length-1;i++){ 
      // this loop will each time get a new substring incrementing the index from 0 to length
      let curr_str = s.substring(i); 
      for(let j=curr_str.length-1;j>0;j--){
        // this loop will find all possible symmetric substrings in the above indexed substring
        let str = curr_str.substring(0,j)
        if(str === str.split('').reverse().join('')){
          if(longest_symmetric.length < str.length){

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Directly from CLI

alias x='exit'
funcsave x

or create a file in

~/.config/fish/functions 

with name