lesson_6.md

Homework Lesson 6

Leap years

• Create a program that outputs all leap years between 1900 and 2200
• Here's a quote from the german Wikipedia explaining the rules:
  • Die durch 4 ganzzahlig teilbaren Jahre sind, abgesehen von den folgenden Ausnahmen, Schaltjahre.
  • Säkularjahre, also die Jahre, die ein Jahrhundert abschließen (z. B. 1800, 1900, 2100 und 2200), sind, abgesehen von der folgenden Ausnahme, keine Schaltjahre.
  • Die durch 400 ganzzahlig teilbaren Säkularjahre, zum Beispiel das Jahr 2000, sind jedoch Schaltjahre.
• You can check the Wikipedia article as well for a full list to check your result against.

Find me something

• Create an array with some random data (think of something fun yourself, could be strings, could be numbers)
• Create a single variable that contains something that may or may not be in the array
• Write some code that finds out if the thing in the variable is also in the array

  let haystack = [1,2,3,4,5];
  let needle = 7;
  let found = false
  // code for finding the needle in the haystack
  // for(...) {
  //   ...
  // }
  console.log("Found?", found);

Who here has the longest name

Given the following array:

let names = ["Anne", "Dick", "George", "Ju", "Timmy"];

Find and output the longest name in the list.

Hint: Strings in many ways behave like Arrays and one of that way is that strings also have a .length property we can use:

let name = "Jan"
name.length // => 3

Tipps

You can solve this with one variable that just holds the current candidate for the longest string and then you can compare that variable against the current array item in a for loop. If the current array item is longer, replace the current candidate in the variable with the current array item.

Or, you can solve this with two variables, where one holds the index of the current candidate, and one holds the current maximum length. Try both approaches, maybe, and figure out which one you like more