How to check in array if it contains given element

Question

I am trying below code but its not working so first am trying to get a person department Name currently, hard coded it to check

var arr=[]
let CurrDept = "AB-CDE-F";
var Detept=CurrDept.substring(0,5);
arr.push(Detept)

Now in below line of code i am trying this line so it should exclude all results which start from AB-CD

var Userprofiledept=data.value[0].UserId.Department;
const isInArray = arr.indexOf(Userprofiledept) > -1;

isInArray should be false which can be put in my condition but it always give true

Can anyone help ?

So current user department may be AB-CDE-F and data i am getting from my rest call may have lots of department for many users AB-CDE-F,AB-CDE-F,AB-CDE,AB-CD,AB-C

so only want to exclude results which are AB-CDE-F,AB-CDE-F,AB-CDE,AB-CD as they are starting with AB-CD

Answer 1

You could move the functionality into a function and check if the substring exists and add, if necessary.

 const add = string => { string = string.slice(0, 5); if (array.includes(string)) return; array.push(string); } array = []; add('AB-CDE-F'); console.log(array); add('AB-CDE-F'); console.log(array); add('AB-CDE'); console.log(array);

Answer 2

You can use Array.prototype.filter and String.prototype.startsWith .

 const data = {value: [{ UserId: { ID: 14, Email: "sdfds", Department: "AB-CD-EF" } }, { UserId: { ID: 14, Email: "sdfds", Department: "AB-CD" } }, { UserId: { ID: 14, Email: "sdfds", Department: "AB-C" } }]}, discard = "AB-CD", res = data.value.filter((v) => !v.UserId.Department.startsWith(discard)); console.log(res);