//indexOf()
const arr2 = [1,2,567,4,5]
//Below the indexOf searches for the value '567'
const findIndexOfValue567 = arr2.indexOf(567);
//this is then returned as an index
console.log(findIndexOfValue567)
//if the argument you place in the method is not there...
const isThisValueThere = arr2.indexOf(989);
//then a value of -1 is returned
console.log(isThisValueThere)