Best Way to Code

 this.carriers = this.carriers.filter((el, i, a) => i === a.indexOf(el))

  this.customerid = Number(text);

let newObject = Object.assign({}, currentObject);

var arr1 = [1, 2, 3, 4, 5];
var arr2 = [2, 4];

var arr = arr1.filter(x => { return arr2.indexOf(x) === -1; });

  
  public search(name: string): void {
    if (name.trim().length > 0) {
      this.employees = this.employeeSource.filter(x => x.name.toLowerCase().indexOf(name.trim().toLowerCase()) >= 0);
    }
  }  
  
  

  public getTotalWeight(): number {
    var total = 0;
    if (this.items != null && this.items.length > 0) {      
      this.items.forEach(x => total += x.weight);
    }
    return total;
  }  

       <asp:RadioButtonList runat="server" ID="radReportType" onchange="displayReportType();" RepeatDirection="Horizontal">
           <asp:ListItem Text="Shipment" Value="Fruit" Selected="True">
           <asp:ListItem Text="Customer" Value="Vegetable">
           <asp:ListItem Text="Carrier" Value="Meat">
       </asp:RadioButtonList>

   var radio = $("[id*=radFruits] input:checked");
   var value = radio.val();

How to validate multiple line values using JavaScript and Regular Expression.
Problem: I want to validate if my textarea contains only number. But my textarea accepts multiple Number values separated by break line.
1234
6743
2934
2134

Solutions:

1. Merge the value into single line of code by replacing the end of line character with empty string
2. Check if the value is number using regular expression

function isNumber(value){
   var pattern = new RegExp("^[0-9]+$");
   value = value.replace(/\n/g,"");
   return pattern.test(value);
}

Using JavaScript to custom validate asp.net control.

function ValidateAge(source, arguments){
    var pattern = new RegExp("^[0-9]{2}$");
    if (!pattern.test(arguments.Value)){
         source.errormessage ="Age must be numeric";
         arguments.IsValid = false;
    }else{
         arguments.IsValid = true;
    }
}

<asp:CustomValidator 
     id="valCustom" 
     ControlToValidate="txbAge"
     ClientValidationFunction="ValidateAge"
     OnServerValidate="ValidateAge"
     ErrorMessage="This can be set from code"
     ForeColor="red" 
     runat="server">
     ValidationGroup="valSave"
</asp:CustomValidator>