yairEO

import React, { useEffect, useRef } from 'react';

const useDidMountEffect = (func, deps) => {
    const didMount = useRef(false);

    useEffect(() => {
        if (didMount.current) func();
        else didMount.current = true;
    }, deps);
}

yairEO

const mockAjax = (timeout => (RES, duration) => {
  clearTimeout(timeout); // abort last request
  return new Promise((resolve, reject) => timeout = setTimeout(resolve, duration || 0, RES))
})()

yairEO

function arrayIncludesObj(arr, obj){
    return arr.some(arrObj => JSON.stringify(arrObj) == JSON.stringify(obj))
}

yairEO

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

yairEO

/**
 * @param {string} s [HTML string]
 */
function minify( s ){
  return s ? s
    .replace(/\>[\r\n ]+\</g, "><")  // Removes new lines and irrelevant spaces which might affect layout, and are better gone
    .replace(/(<.*?>)|\s+/g, (m, $1) => $1 ? $1 : ' ')
    .trim()
    : ""
}

yairEO

function replaceTextWithNode( elm, text, replacerNode ){
  var iter = document.createNodeIterator(elm, NodeFilter.SHOW_TEXT),
      textnode,
      idx,
      maxLoops = 100,
      replacedNode;

  while( textnode = iter.nextNode() ){
      if( !maxLoops-- ) break;
      // get the index of which the tag (string) is within the textNode (if at all)

yairEO

function getCaretCharOffset(elm) {
    var caretOffset = 0;

    if (window.getSelection) {
        var range = window.getSelection().getRangeAt(0),
            preCaretRange = range.cloneRange();
        preCaretRange.selectNodeContents(elm)
        preCaretRange.setEnd(range.endContainer, range.endOffset)
        caretOffset = preCaretRange.toString().length
    }

yairEO

var opts = process.argv.reduce((result, item) => {
  if( item.indexOf('--') == 0 )
    result[item.replace('--','')] = 1
  return result;
}, {})

yairEO

[...Array(10)].map(() => {
  const randomStr = "abcdefghijklmnopqrstuvwxyz".split('').sort(() => .5-Math.random()).join('');
  return randomStr.slice(0, Math.random()*26 + 2)
})

yairEO

var str = "aaa {{xxx}} bb {{x}} ccc {{vv}}";

// split by "start" pattern
str.split('{{').map(s1 => {
  // for each splited part, split again by "end" pattern 
  var s2 = s1.split('}}');
  // if this split resulted in an array with more than 1 item, it means the first item was between the patterns
  if( s2.length > 1 ){
    s2[0] = "foo" // replace the array item with whatever
  }