Having trouble falling asleep? It might be time to start counting some sheep. But, instead of counting with numbers, we're going to count the numbe...
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What you list as the "simplest way to solve this problem" is not actually the simplest solution. There is already a built-in JavaScript function that achieves this result:
If you want to technically meet the full requirement (which is to provide your own function that does this), then you just need to wrap the built-in JS solution in a function like:
You may use Boolean too
Wow, that's great Adam! I'm only 4 weeks into my studies, so I definitely have a lot more to learn. Thanks for posting this solution. I'll be using this!
I normally wouldn't make this kinda pedantic observation, but since you say you're "only 4 weeks into studies"...
Get rid of the
var
. You don't want to use that in "modern" JavaScript design. You should always, always, always uselet
orconst
.It may feel right now like that's a semantic, rather useless, observation. But it's not just based on coding dogma. JavaScript has some particular, umm... headaches regarding
this
and the hoisting ofvar
-declared variables into global scope. These headaches are solved by religiously sticking withlet
orconstant
.The full description of why
var
is "problematic" is far longer than I care to type in this reply. But as you get further down your studies, it's a good thing to research.Also, FWIW, the
var
keyword tends to cause headaches in other languages as well (e.g., C#).Instead of counting sheep, how about we reduce them?
What's going on here? Where did the sum come from?? Adding the a boolean to a sum??? Are you nuts?!
Ok let's go step by step.
sum
. The value that you return in the reducer function becomes the accumulator for the next iteration.true
.true
.true
, we want to increment thesum
by 1.sum = sum + (true ? 1 : 0)
.sum + boolean
???true
will become1
andfalse
becomes0
. SoNumber(true) === 1
.+
, JavaScript will automatically convert values to numbers for you!Now, you may have noticed that we never declare
sum
anywhere. We never tell the reduce function to start counting at 0. Next to the reducer function,Array.reduce()
can take a second parameter, which is the initial value for the accumulator. If we do not pass an initial value, it will just take the first value of our array.There you have it!
We can just add the boolean to our sum, and it will add 1 if it is
true
or 0 forfalse
, exactly what we want.That's so cool Edwin! Reduce sounds like a very interesting prototype that I'm going to look into more!
Nice One!
You can also do this with a one-liner es6 arrow function using a JavaScript array filter method.
You can read more about the filter method here.
Here I have tried a different approach to this problem.
Taking sheep1 array as reference.
So many different solutions, I love it!
Fun article!
The
array.splice([i], 1);
line should bearray.splice(i, 1)
. Is that what you were looking for?not recommended though.
I dunno why, but based on the title of the post I was expecting a deep neural network which would segment sheeps in a picture and then count them XD
You can embed REPL IT like this:
That's a great tip, thank you! I will use that next time!