/*
Let' s create our array
*/
const n = [2, 4, 6, 8, 10];
/*
map method requires callback function
that will be ran agains every element
in the provided array.
There are two ways to specify callback
function. First, we can specify it inside
map method itself, or we can create separate
function and provide this function to map
method.
*/
//Provide function inside map method
/*
We create variable r that will hold
returned array. Then we run map
against const n. Our callback function
is simple arrow function that multiplies
every item from const n by 2.
*/
const r = n.map(item => item * 2);
console.log(r);
//Output: [4, 8, 12, 16, 20]
//Create separate function and pass it to map
/*
Second example does the same as first.
Difference is that in second example we provide
separate function and pass it to map.
This is better way in terms that you can reuse
function on multiple places
*/
const s = n.map(multiply);
function multiply(item) {
return item * 2;
}
console.log(s);
//Output: [4, 8, 12, 16, 20]