All language subtitles for 133 Who_s Buying Lunch Solution.en_US

All right.

So this was a relatively simple code challenge and the goal is very simple given that we've got a function

called who's paying and we pass in an array of names like this one.

Our function should be able to pick out a random name from this array and be able to return the output

that one of these people is going to buy lunch today.

So let's see how we might tackle this.

Now in order to pick out an item from the array we would tap into the array and we would use a square

bracket to select an item.

So if we said square brackets zero then that's going to pull out the item at position 0 which is the

first one.

And if we did names at position for then that's going to be 0 1 2 3 4 and it's going to pull out the

last item from the array.

So now we basically need a random number that is in the range of 0 to 4 if the input was this long.

But we don't know how long the input could be right.

It could be an array of names as long as my arm.

So given that we don't know that information let's first work that out.

Let's create a variable called number of people which is going to be equal to names dot length.

And this is going to calculate in this array that we got past how many names are there right.

Because once we've got that information then we can work out a random person's position.

Right.

So we could say that the random person position is equal to math at random which is going to generate

a number between 0 and 1 and not including 1.

And then we can multiply it by the number of people then we would get a range of numbers from zero to

nought point 9 9 9 9 9 recurring.

So now if we multiply it by the total number of peoples the number of items in this array.

So in this example we would have five.

So zero multiplied by five is going to be zero but nought point nine nine nine nine nine multiplied

by five is going to become four point nine 0 9 0 9.

So now all we have to do is use the mass dot floor to cut off everything that's at the end of the decimal

place and then we get our range 0 to 4.

So let's go ahead and do that.

So I'm going to wrap everything inside a math dot floor and now and now this random person position

should be a random number between zero and the total number of people minus one giving us all of the

indices that we need to get each item in the array.

So now all that's to do is to pick out the random person and to do that we tap into the list of names

use our square brackets and pass in the random person position.

Now that we've got our random person all that we have to do is provide this output.

So let's return this output.

And we're going to return the random person plus the string is going to buy lunch today.

Exclamation mark.

Now remember to add the space between the random person's name and the rest of the sentence.

And now we've completed the challenge and we're ready to check our solution and all going well it should

work.

And if you run this through replayed or through the Chrome's inputs too you should be able to see that

each time you run this code and you pass in a different array or the same array it should give you a

random name from that list.