Difference Between indexOf and findIndex function of array

Question

I am confused between the difference between the two function indexOf and find Index in an array.

The documentation says

findIndex - Returns

Answer 1

Simple - What kind of array structure are you using?

• If array of objects, findIndex();
• Else, indexOf().

"I want to find the index in an array of objects, with the key of "Orange".

let fruits = [
   { type: "Apple", quantity: 9 },
   { type: "Banana", quantity: 2},
   { type: "Orange", quantity: 8},
   { type: "Pear", quantity: 777}
];

let myIndex = fruits.findIndex(fruit => fruit.type === "Orange"); // Returns 2.

"I want to find the index in a simple array".

let fruits = [ "Apple", "Banana", "Pear", "Orange"];

let index = fruits.indexOf("Orange"); // Returns 3.