Just like for strings, indexOf exists for arrays as well and as you expect, it'll return the position of the element in the array. Take a look:
const arr = ['apple', 'mango', 'banana'];console.log(arr.indexOf('apple')); // 0console.log(arr.indexOf('mango')); // 1console.log(arr.indexOf('apple') >= 0); // true => apple existsconsole.log(arr.includes('apple')); // true => apple existsconsole.log(arr.indexOf('pineapple') >= 0); // false => pineapple // doesn't existsconsole.log(arr.includes('pineapple')); // false => pineapple doesn't //exists
So what's the difference? There's not really a difference unless we talk about NaN and all that weird stuff. For instance:
const arr = ['Some elements I like', ...
