findindex of object in array by key js code example

Example 1: using index of on array of objects

arr = [{x: "a", y: 1}, {x: "something", y: 2}]
arr.findIndex(obj => obj.x === "a" && obj.y === 1);

Example 2: indexOf by object key

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