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) => {
  // Your code:
  console.log(numbers);
 
};

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

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

};

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

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

};

// f) Function which will print to console the smallest number (You can check Math functions)
const printSmallestItem = (numbers) => {
  // Your code:
  console.log(Math.min(...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((a, b) => a + b, 0));

};

// 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:
  console.log(Math.max(...numbers) - Math.min(...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(element => {
    sum += element;
  });
  console.log(sum / numbers.length);
};

// j) Function which will print to console the index of largest number (You can check Math functions)
const printLargestsIndex = (numbers) => {
  // Your code:
  console.log(numbers.indexOf(Math.max(...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:
  let evenNumbers = numbers.filter(element => element % 2 === 0);
  if(evenNumbers.length > 0){
    console.log(evenNumbers);
  } else {
    console.log("Even number isn't in array");
  }


};

// 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:
  console.log(numbers.map(element => element * 2));
};

// printArray(numbers);
// printLength(numbers);
// printFirstItem(numbers);
// printLastItem(numbers);
// printLargestItem(numbers);
// printSmallestItem(numbers);
// printSum(numbers);
// printSALDifference(numbers);
// printAverage(numbers);
// printLargestsIndex(numbers);
// printEvenNums(numbers);
// printNumsMultipliedBy2(numbers);