.map() method creates a new array with the results of calling a provided function on every element in the calling array.
.map() accepts a callback function as one of its arguments and an important parameter of that function is the current value of the item being processed by the function. This is a required parameter. With this parameter, you're able to modify each individual item in an array and create a new function off it.
const sweetArray = [2, 3, 4, 5, 35]
const sweeterArray = sweetArray.map(sweetItem => {
return sweetItem * 2
})
console.log(sweeterArray) // [4, 6, 8, 10, 70]