task-array.js

// EXERCISE:
// You can write all the code natively (for cycles and such) or you can use some advanced functions which JS arrays provides in case you see them fit
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
// There can be multiple solutions to each task, solve it as you see fit.
// You will work with array `numbers` which will be generated by code (code below) in every task.
// Write these functions:

// This block generates array with random length with values between 1-100
let numbers = [];
const length = Math.ceil(Math.random() * 10) + 5;
for (let i = 0; i < length; i = i + 1) {
    numbers.push(Math.ceil(Math.random() * 100));
}

// a) Function which will print to console a whole array
const printArray = (numbers) => {
    console.log(numbers);
};
printArray(numbers)


// b) Function which will print to console the length of array
const printLength = (numbers) => {
    // Your code:
    console.log(numbers.length);
};
printLength(numbers);


// c) Function which will print to console the first element of array
const printFirstItem = (numbers) => {
    // Your code:
    console.log(numbers[0]);
};
printFirstItem(numbers);


// d) Function which will print to console the last element
const printLastItem = (numbers) => {
    // Your code:
    console.log(numbers.slice(-1)[0]);
};
printLastItem(numbers);


// e) Function which will print to console the largest number (You can check Math functions)
const printLargestItem = (numbers) => {
    // Your code:
    console.log("max:", Math.max(...numbers));
};
printLargestItem(numbers);


// f) Function which will print to console the smallest number (You can check Math functions)
const printSmallestItem = (numbers) => {
    // Your code:
    console.log("min:", Math.min(...numbers));
};
printSmallestItem(numbers);


// g) Function which will print to console the sum of all numbers in array (You can check reduce function)
const printSum = (numbers) => {
    // Your code:
    console.log(numbers.reduce((sum_, x) => sum_ + x, 0));
};
printSum(numbers)

// h) Function which will print to console the difference between the largest and the smallest number (You can check Math functions)
const printSALDifference = (numbers) => {
    // Your code:
    let min = Math.min(...numbers);
    let max = Math.max(...numbers);
    console.log(max - min);
};
printSALDifference(numbers);


// i) Function which will print to console the average of all numbers (You can check reduce function)
const printAverage = (numbers) => {
    // Your code:
    let sum = 0;
    numbers.forEach(value => {
        sum += value;
    })

    console.log(sum / numbers.length);

};
printAverage(numbers);


// j) Function which will print to console the index of largest number (You can check Math functions)
const printLargestsIndex = (numbers) => {
    // Your code:
    let max = Math.max(...numbers);

    console.log(numbers.indexOf(max));

};
printLargestsIndex(numbers);


// k) Function which will print to console the even numbers (not the array of even numbers),
// if array doesn't contain any even number, show text "Even number isn't in array"
const printEvenNums = (numbers) => {
    // Your code:
    numbers.filter(num => num % 2 === 0).forEach(num => console.log(num));


};
printEvenNums(numbers);


// l) Function which will multiple by 2 every number in array and print the array to console
// Example: printNumsMultipliedBy2([1,2,3]) -> [2,4,6]
const printNumsMultipliedBy2 = (numbers) => {
    // Your code:
    numbers.map(num => num * 2).forEach(num => console.log(num));

};
printNumsMultipliedBy2(numbers);