04.js

'use strict'     //  LOOPS


console.log('CLASSICAL LOOP') // CLASSICAL LOOP

for (var i = 0; i < 10; i++) {
    console.log('i:', i)
}



console.log('\nCLASSICAL LOOP WITH ARRAYS') // CLASSICAL LOOP WITH ARRAYS

var numbers = [-3.2, 5.3, 3, 1]

for (var i = 0; i < numbers.length; i++) {
    console.log(numbers[i])
}



console.log('\nREVERSE LOOP') // REVERSE LOOP

for (var i = 5; i >= 0; i--) {
    console.log('i:', i)
}



console.log('\nNESTED LOOP') // NESTED LOOP

for (var i = 0; i < 3; i++) {
    console.log('i:', i)
    for (var j = 2; j > 0; j--) {
        console.log('j:', j)
        for (var k = 0; k < 2; k++) {
            console.log('k:', k)
        }
    }
}



console.log('\nITERATOR LOOP') // ITERATOR LOOP

var colors = ['red', 'green', 'blue', 'yellow']

for (var color of colors) {
    console.log(color)
}



console.log('\nWHILE LOOP') // WHILE LOOP

i = 0
while (i <= 3) {
    i++
    console.log('Hello', i)
}



console.log('\nDO-WHILE LOOP') // DO-WHILE LOOP

i = 0
do {
    i++
    console.log('Bye', i)
} while(i <= 3)



console.log('\nEXAMPLE 1 (SUMMATION): sum up all the elements of an array') // EXAMPLE 1

var my_array = [-4.3, 2, -0.7, 1.5, 3.5]
var sum = 0

for (var i = 0; i < my_array.length; i++) {
    sum = sum + my_array[i]
}

console.log('The sum of all the elements of the array is', sum, '\n')



console.log('\nEXAMPLE 2 (PRODUCT): multiply all the elements of an array') // EXAMPLE 2

var my_array = [3, 2, -1, 1, 4]
var prod = 1

for (var i = 0; i < my_array.length; i++) {
    prod = prod * my_array[i]
}

console.log('The multiplication of all the elements of the array is', prod, '\n')