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

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

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

// f) Function which will print to console the smallest number (You can check Math functions)
 const printSmallestItem = (numbers) => {
  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) => {
  let sum = 0;
  for (item of numbers){
    sum += item;
  } 
  console.log(sum);
};

// h) Function which will print to console the difference between the largest and the smallest number (You can check Math functions)
 const printSALDifference = (numbers) => {
  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) => {
  const sum = numbers.reduce((a, b) => a + b, 0);
  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) => {
  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) => {
  for (item of numbers){
    if(item % 2 === 0){
      console.log(item);
    }
  }
};

// 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) => {
  const multipliedArray = numbers.map(num => num * 2);
  console.log(multipliedArray);
};