NG8- Validation - upload header columns order in Angular

NG8- Validation - upload header columns order in Angular
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component.ts:
===================

fileReaded;
arrIndex;
onFileSelect(fileInput: any){
  //read file from input
  this.fileReaded = fileInput.target.files[0];
 
  let reader: FileReader = new FileReader();
  reader.readAsText(this.fileReaded);
 
    reader.onload = (e) => {
      let csv: any = reader.result;
      let headers;
      let allTextLines = csv.split(/\r|\n|\r/);
      //col_ord1|col_ord2|col_ord3|col_ord4|col_ord5|col_ord6

      let checkHeader = [ "col_ord1|col_ord2|col_ord3|col_ord4|col_ord5|col_ord6", "", ""]
      for (let i = 0; i < allTextLines.length; i++) {
        // split content based on comma
        let data = allTextLines[i].split(',');
        //console.log(data)
     
        var c= checkHeader.filter(checkHeader => !data.includes(checkHeader));

        if(c.length == 0){
          headers=allTextLines[i].split(',');
          this.arrIndex = i+1;
          console.log('header matchecd');
          break;
        }
        else{
          console.log('header doesnt matchec');
        }
      }


      let lines = [];
   
      for (let i = this.arrIndex; i < allTextLines.length; i++) {
        // split content based on comma
        let data = allTextLines[i].split(',');
        if (data.length === headers.length) {
          let tarr = [];
          for (let j = 0; j < headers.length; j++) {
            tarr.push(data[j]);
          }

          // log each row to see output
          console.log(tarr);
          lines.push(tarr);
    }
     
      }
      // all rows in the csv file
     // console.log(">>>>>>>>>>>>>>>>>", lines);
    }
 }


  template.html
  ==============
 
 
  <div class="form-group">
    <input type="file" (change)="onFileSelect($event)" name="myfile">
  </div>