Дмитрий

order[index] = {...order[index], count: blablabla }

$sku = isset($_GET['sku']) ? str_replace(" ", "", $_GET['sku']) : null;

if (is_numeric($sku)) { // если начало с цифры
    $filter = ['idProduct', $sku, true];  
} elseif (substr($sku, 0, 5) == 'https') { // если начало с https
    $beforeBlockMain = strstr($sku, '?block_main', true) || $sku;
    $filter = ['linkProduct', $sku . ($sku_new ? '/' : ''), false];
} elseif ($sku) {
    $filter = ['name', "%" . $sku . "%", true];
}

if ($filter) {
    $attrName = $filter[0];
    $value = $filter[1];
    $operator = $value[0] == "%" ? " LIKE " : " = ";
    $limit = $filter[2];

    $sql = "SELECT * FROM products WHERE " . $attrName . $operator . $value . ($limit ? " LIMIT 0,1" : "");
}

var str = Array.from(document.getElementsByClassName('test'))

function getIntervals (arr) {
   const mlsInterval = 30 * 60 * 1000

   const openHours = arr.filter(v => v.type === 'open').flatMap(v => {
      const [d1, d2] = [new Date(v.from).getTime(), new Date(v.to).getTime()]
      const length = Math.floor(( d2 - d1 ) / mlsInterval)
      const hours = Array.from({ length }, (z, ind) => new Date(d1 + ind * mlsInterval))
      return hours
   })

   const closeIntervals = arr.filter(v => v.type === 'closed').map(v => 
     [new Date(v.from).getTime(), new Date(v.to).getTime()]       
   )

   const result = openHours.filter(v =>  
     !closeIntervals.some(([start, stop]) => start <= v && stop > v)
   ).map(v => new Date(v).toString().match(/\d\d:\d\d:\d\d/g)[0])

   return result
}

const length= 5; // передается в props
Array.from({ length }, (_, index) => <MyComponent key={`_${index}`} /> );

Array.from(document.querySelectorAll('input')).every(v => v.value)

const nextAfter = (arr, value) => {
  const ind = arr.indexOf(value) 
  if (ind < 0) return 
  return arr[ind + 1] // для предыдущего -1
}

arr.find((v, ind, arr) => arr[ind - 1] === value) 
// для предыдущего +1, не путать с первым примером

<Chart updateData={ [datasetIndex, newLabels, newData] }/>

if (props.updateData) updateDataset(...props.updateData)

let updateDataHandler = {}
return <Chart updateDataHandler={ h => { updateDataHandler = h } }/>