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function zeroPad(num, places) {
    var zero = places - num.toString().length + 1;
    return Array(+(zero > 0 && zero)).join("0") + num;
}

//to use
const newRunningNumber = zeroPad((ticketNumExisting.length + 1),4); //e.g 0052

const has = function(obj, key) {
    return key.split(".").every(function(x) {
        if(typeof obj != "object" || obj === null || ! x in obj)
            return false;
        obj = obj[x];
        return true;
    });
}

//usage
const attachmentFile1= has(nextProps, 'attachmentFiles.issue.issue1') ?
    nextProps.attachmentFiles.issue.issue1 : '',

function removeDuplicates(originalArray, objKey) {
  var trimmedArray = [];
  var values = [];
  var value;

  for(var i = 0; i < originalArray.length; i++) {
    value = originalArray[i][objKey];

    if(values.indexOf(value) === -1) {
      trimmedArray.push(originalArray[i]);
      values.push(value);
    }
  }

  return trimmedArray;

}

//Data
[
    {
        "color": "red",
        "size": "small"
    },
    {
        "color": "blue",
        "size": "medium"
    },
    {
        "color": "red",
        "size": "large"
    }
]

//Usage
removeDuplicates(arrayWithDuplicates, 'size');

const checkedLineItems = this.state.newLineItems.filter((item) => {
            return item.checkboxe === true;
        });
 
console.log(checkedLineItems.length);