get the first value of array with map code example

Example 1: get the index of object in array

a = [
  {prop1:"abc",prop2:"qwe"},
  {prop1:"bnmb",prop2:"yutu"},
  {prop1:"zxvz",prop2:"qwrq"}];
    
index = a.findIndex(x => x.prop2 ==="yutu");

console.log(index);

Example 2: how to find the index of a value in an array in javascript

var list = ["apple","banana","orange"]

var index_of_apple = list.indexOf("apple") // 0

Example 3: how to get the last element in an array in c#

using System;

public class Demo {
   public static void Main() {
      string[] str = new string[] {
         "Java",
         "HTML",
         "jQuery",
         "JavaScript",
         "Bootstrap"
      };
      Console.WriteLine("Array...");
      foreach(string res in str) {
         Console.WriteLine(res);
      }
      Console.WriteLine("Last element: "+str[str.Length - 1]);
   }
}

Example 4: how to get the index of an array in javascript

search = (arr, item) => { return arr.indexOf(item); }