check for duplicate key in object array js code example
Example 1: array of objects how to check if property has duplicate
var yourArray = [
{Index: 1, Name: "Farley, Charley", EmployeeCode: "12", PaymentType: "Void", CheckDate: "01/04/2012"},
{Index: 2, Name: "Farley, Charley", EmployeeCode: "12", PaymentType: "Void", CheckDate: "01/04/2012"},
{Index: 3, Name: "Tarley, Charley", EmployeeCode: "12", PaymentType: "Void", CheckDate: "01/04/2012"}
];
unique = [...new Set(yourArray.map(propYoureChecking => propYoureChecking.Name))];
if (unique.length === 1) {
console.log(unique);
}
Example 2: js check if array of objects contains duplicates
const arrayOfObjCopy = [...arrayOfObj];
Object.keys(arrayOfObjCopy).forEach((key) => {
arrayOfObjCopy[key] = JSON.stringify(arrayOfObjCopy[key]);
});
const arrayOfObjhasDuplicates = uniq(arrayOfObjCopy).length != arrayOfObjCopy.length;