how to find index of an object by key and value in an javascript array code example

Example 1: find index of object in array javascript

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: indexOf by object key

var index = peoples.findIndex(p => p.attr1 == "john")

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

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