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);
};

console.log("-----printArray------");
printArray(numbers);

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

console.log("-----printLength------");
printLength(numbers);

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

console.log("-----printFirstItem------");
printFirstItem(numbers);

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

console.log("-----printLastItem------");
printLastItem(numbers);

// e) Function which will print to console the largest number (You can check Math functions)
  const printLargestItem = (numbers) => {
    console.log(Math.max(...numbers));
};
console.log("-----printLargestItem------");
printLargestItem(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));
};
console.log("-----printSmallestItem------");
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(
      (accumulator, cv) => accumulator + cv));
};
console.log("-----printSum------");
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:
    console.log(Math.max(...numbers)-Math.min(...numbers));
};
console.log("-----printSALDifference------");
printSALDifference(numbers);
// i) Function which will print to console the average of all numbers (You can check reduce function)
  const printAverage = (numbers) => {
  // Your code:
  var sum = numbers.reduce(
    (accumulator, cv) => accumulator + cv);
    
    console.log(sum / numbers.length);
};
console.log("-----printAverage------");
printAverage(numbers);
// j) Function which will print to console the index of largest number (You can check Math functions)
  const printLargestsIndex = (numbers) => {
  // Your code:
    const Max = Math.max(...numbers);
    console.log(numbers.indexOf(Max));

};
console.log("-----printLargestsIndex------");
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:
  const even = (element) => element % 2 === 0;
  console.log(numbers.some(even)?"Even numbers:":"Even number isn't in array");
  numbers.forEach(n => {
    if(n % 2 === 0)
      console.log(n);
  });
};
console.log("-----printEvenNums------");
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:
    console.log(numbers.map((n)=> n*2));

};
console.log("-----printNumsMultipliedBy2------");
printNumsMultipliedBy2(numbers);