如何防止数组中的重复记录

I need to prevent inserting duplicate Rec in $scope.EmployeeList Array For that i wrote if ($scope.EmployeeList.indexOf(EmpDetails) == -1) but its not filtering my rec

我需要防止在$scope中插入重复的Rec。我为它编写的EmployeeList数组($scope.EmployeeList.indexOf(EmpDetails) = -1)，但它没有过滤我的rec

 $scope.EmployeeList = [];
        var amtArray = [];
        $scope.G_Total = "Total Amount is";
        $scope.SaveDb = function (Isvalid) {
            var EmpDetails = {
                'EmpName': $scope.EmpName,
                'Email': $scope.Email,
                'Cost': $scope.cost

            }
            if ($scope.EmployeeList.indexOf(EmpDetails) == -1) {
                $scope.EmployeeList.push(EmpDetails);
                console.log($scope.EmployeeList);
            }
            else
                alert('Duplicate Value....');

2 个解决方案

#1

Don't use indexOf (it checks for strict equality), try findIndex:

不要使用indexOf(它检查严格相等)，试试findIndex:

if ($scope.EmployeeList.findIndex(function(e) { return e.EmpName === EmpDetails.EmpName; }) === -1) {
    $scope.EmployeeList.push(EmpDetails);
    console.log($scope.EmployeeList);
}

#2

You can also use Array.prototype.some to find duplicate value.The some() method tests whether at least one element in the array passes the test implemented by the provided function.

您也可以使用Array.prototype。有些是为了找到重复的值。some()方法测试数组中的至少一个元素是否通过所提供函数实现的测试。

var empDetails = {name: 'abc', email: 'a@gmail.com'};

let duplicate = $scope.EmployeeList.some(function (emp) {
  return emp.name === empDetails.name && emp.email === empDetails.email;
});

if (!duplicate) {
   $scope.EmployeeList.push(EmpDetails);
}
else
   alert('Duplicate Value....');

#1