calls a function once for each array elements

here now we will create a new array by performing a fucntion on each array elements

Create a new array with all array elements that passes the test

in this example we will find the sum of all the numbers in an array

the reduce() method can accept an initial value.

in this example we will find the sum of all the numbers in an array

in this example we will find the sum of all the numbers in an array

check if all array values are larger than 18: