Day 7 — Arrays — basics and iteration

Homework

Problem 1 Part 1 
const names = ["xyz", "abc", "kal"];
const greetings = names.map(name => `Hello, ${name}`);
console.log(greetings);

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 2 Part 2 
const nums = [1, 2, 3, 4, 5, 6, 7, 8];

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 3 Part 3 
const evenSum = nums
  .filter(n => n % 2 === 0)
  .reduce((sum, n) => sum + n, 0);

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 4 Part 4 
console.log(evenSum);

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 5 Part 5 
const arr = [3, 1, 4, 1, 5, 9, 2, 6];

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 6 Part 6 
const max1 = Math.max(...arr);
const max2 = arr.reduce((max, n) => n > max ? n : max, arr[0]);

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 7 Part 7 
console.log(max1); 
console.log(max2);

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 8 Part 8 
function average(arr) {
  const sum = arr.reduce((total, n) => total + n, 0);
  return sum / arr.length ;
}

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).

Problem 9 Part 9 
console.log(average([10, 20, 30])); // 20

Reference solution lives in ../js/homework.js (loaded at the bottom of this page).