NewStats: 3,265,443 , 8,186,761 topics. Date: Sunday, 15 June 2025 at 01:16 AM 133f23

Programmers in the house. i need explanation on the purpose of this code: please what is the purpose of (!!) in javascript

timpd = (!!arr[i-1][j-1]?arr[i-1][j-1]:0)+(!!arr[i-1][j]?arr[i-1][j]:0);
arr[i].push(timpd);

Just saw this for the first time after a friend of mine told me about Andela. How do i go about applying? Just started learning programming lately and i think this is a good opportunity for advancement.

naijanoni:

You can send me a mail. It is a video tutorial. About 7GB

I also need your email. I need the tutorials

maigemuu:
Programmers in the house. i need explanation on the purpose of this code: please what is the purpose of (!!) in javascript

timpd = (!!arr[i-1][j-1]?arr[i-1][j-1]:0)+(!!arr[i-1][j]?arr[i-1][j]:0);
arr[i].push(timpd);

Check these links:

https://stackoverflowdotcom/questions/9284664/double-exclamation-points

Change the 'dot' to .

maigemuu:
Programmers in the house. i need explanation on the purpose of this code: please what is the purpose of (!!) in javascript

timpd = (!!arr[i-1][j-1]?arr[i-1][j-1]:0)+(!!arr[i-1][j]?arr[i-1][j]:0);
arr[i].push(timpd);

The (!! - not not) trick is used in js to convert a value to Boolean and ensures a Boolean type. JavaScript has a weird mechanism of evaluating a value to either Truthy or Falsy


This link explains more on that

https://codeburst(dot)io/javascript-truthy-values-dont-always-equal-true-8afaf071a4a6

still on it and deadline is today

samnelly4u:


Have you done the interview challenge code?

Please I need the videos you used during your time,
mail mail here [email protected]
Thank you and God bless

naijanoni:
Hello guys.
Just for encouragement:
I only started learning programming around May this year, and I just made it into the fellowship.
So if you just started programming, you too can get in soon, but u have to give it your all.
Right from May till now, it has been non-stop, no-sleep learning.
Three weeks before the bootcamp project, I had zero knowledge of anything backend. Node/express/database, I didn't know any of them. At the start of the bootcamp project, I didn't know how to use git. How I was able to cover so much in very little time still surprises me.
Get good resources and keep studying hard!. Your hard work would pay off soon.
Special thanks to my ogas Don Pikko, guente02, isarray for assisting whenever I ask questions here.
The journey begins, there is still a lot to learn.

Mekzy02:
Thanks fizzle, pls is node.js different from express? I normally see them combined tho.

I used to ask same question too till I discovered expressjs makes backend development in JavaScript easy. It's built on top of nodejs. For example writing a simple server in express Js is simpler with less lines of code than in node. So basically, your work is made easier using high level expressjs to low level nodejs. So expressjs is a child of node which has other frameworks built on it. Hope this makes sense?

maigemuu:
Programmers in the house. i need explanation on the purpose of this code: please what is the purpose of (!!) in javascript

timpd = (!!arr[i-1][j-1]?arr[i-1][j-1]:0)+(!!arr[i-1][j]?arr[i-1][j]:0);
arr[i].push(timpd);


i understand below is a "class".

.block:nth-child(even) {
background: red;
}

when do i use nth-child....

i searched google but still got confused

The JavaScript code gives you 2 dimensional array i.e array in array like nested if statement. It's to generate pascal triangle. say you input 3

the result would be
1
11
121
it will always initialize the first and last number to 1 and add the number directly above it together.

Please what prior knowledge is needed to apply. I have only learnt HTML and partly CSS recently. What else do I have to learn to be able to apply and succeed?

Suplexx:
Please what prior knowledge is needed to apply. I have only learnt HTML and partly CSS recently. What else do I have to learn to be able to apply and succeed?

You need to learn JavaScript. Then some backend like node/express js.
Bro the most important thing required for you to apply is; ion and the ability to learn.
Good luck. I also applied too

gentletalkaktiv:


I used to ask same question too till I discovered expressjs makes backend development in JavaScript easy. It's built on top of nodejs. For example writing a simple server in express Js is simpler with less lines of code than in node. So basically, your work is made easier using high level expressjs to low level nodejs. So expressjs is a child of node which has other frameworks built on it. Hope this makes sense?

Yes it does boss. Thanks.
Are you in Andela? Or yet to enter?

CuteMaro:
Just saw this for the first time after a friend of mine told me about Andela. How do i go about applying? Just started learning programming lately and i think this is a good opportunity for advancement.

I need a coding buddy tho. Learning too!

Mekzy02:

You need to learn JavaScript. Then some backend like node/express js.
Bro the most important thing required for you to apply is; ion and the ability to learn.
Good luck. I also applied too

Thanks

Mekzy02:

I need a coding buddy tho. Learning too!

Nice.. So how far have u gone?

CuteMaro:

Nice.. So how far have u gone?

Currently learning JavaScript. Would soon enter node.js once I become comfortable solving basic JavaScript problems. So how bout you bro?

Mekzy02:

Yes it does boss. Thanks.
Are you in Andela? Or yet to enter?

Nice one bro. I'm yet to get in.

Mekzy02:

Currently learning JavaScript. Would soon enter node.js once I become comfortable solving basic JavaScript problems. So how bout you bro?

u've gone far man.. Nice one. I'm still playing around css for now.. Can we talk on WhatsApp? If yes then my digits are on my signature. Looking forward to hearing from u.

CuteMaro:

u've gone far man.. Nice one. I'm still playing around css for now.. Can we talk on WhatsApp? If yes then my digits are on my signature. Looking forward to hearing from u.

Okay thats cool. Hit u up later.

gentletalkaktiv:



Nice one bro. I'm yet to get in.

OK you still in bootcamp or .... ?

naijanoni:

Hi.
Fourth week you'll be using the Fetch API (which is very simple) not Ajax (except things have changed). What were u asked to use in the instructions?
I saw some Fetch API links shared in the previous page.
This is a short and simple tutorial on Fetch:
https://flaviocopes.com/fetch-api/

By the way, you might not even start challenge 4 in bootcamp. On the last day of bootcamp, we were only expected to have completed challenge 3 of the project.
Our defence on the last day was on the project up to challenge 3.
I just started my challenge 4 yesterday.
Next week, what you'll be doing mostly is modifying your challenge 1 and 2 work based on the s you'll receive from your LFA.
However, that might not be the case for all bootcamps (this was my first bootcamp, I dont know how other bootcamps are).
So its always good to be prepared for everything.

Na as you talk am e dey go. I never touch challenge 3.

41 Circle I received the test yesterday check your mail.

ainas247:
41 Circle I received the test yesterday check your mail.

Yeah boss I've recieved mine too

Please is there a watsap group link. I will like to be added. Pls can i get the link. Thanks.

Anthonyfor12345:
Please is there a watsap group link. I will like to be added. Pls can i get the link. Thanks.

Men I was just thinking of this. It is a good idea!

Yes o

Mekzy02:

OK you still in bootcamp or .... ?

Since i am not in bootcamp then ... Should be the appropriate response�

Please do they provide accommodation during Bootcamp? I am not Lagos based and I don’t know any body there.

Are you looking for a photographer for street shots with any budget or do you wanna do a viral video, music video, covering of wedding, and shows etc
Please me via WhatsApp handle 07015421422
I work with every budget

Yayaadu:
Please do they provide accommodation during Bootcamp? I am not Lagos based and I don’t know any body there.

No.
Andela doesn't provide accommodation for bootcampers

Babadee30:

No.
Andela doesn't provide accommodation for bootcampers

Oh I see. Thank you

Please I need good tutorials on postgreSQL/TDD. cc isArray Guente Don Pickko Thanks in advance