Replace Loops using Recursion - Free Code Camp

This is a basic JavaScript tutorial where we replace loops using recursion. Recursion is quite difficult for me to get my head around in general.

[sturgeonphillip]

Don't stop making videos just because this one didn't go too hot. I've found a lot of value in your other lessons. It is extremely helpful to see someone else go through a breakdown and think through these while on camera. Hearing your internal process with each bit of info is great. Thank you.

[mitsk]

It helps tremendously just hearing you phrase the instructions in a clearer way. Thank you.

[JosueOrNoSway]

Was more confused after watching this. @Muhammad Amer gives a great explanation that actually makes sense below

[temitopeabiodun]

I totally got more confused after watching this I believe there should be a simpler way to do this.

[irishmansteve]

at what point are we defining n tho, i don't get it

[ridewithrespect]

this is the correct code
if(n <= 0) {
return 0;
} else {
return sum(arr, n - 1) + arr[n - 1];
}

[carolinafe]

what is this problem even asking? how do you get 5 from (sum[2, 3, 4], 1)? whats going on

[yorshazli]

why we should return 0 instead of 1? . I mean, if I change 0 to false, the answer is true and pass correctly, but if I change 1 to TRUE the test doesn't pass

[ConfidentGrips]

IF anyone watches this his errors was not the print statement it was line 4 if ( n >= 0) {
the correct statement is if (n <= 0) { he fixes this in the fast forward but does not mention it

[snipereye]

function sum(arr, n) {
// Only change code below this line
if(n <= 0){
return 0;
}else{
return sum(arr, n-1) + arr[n-1];
}
// Only change code above this line

}
console.log(sum([2, 3, 4], 1))

[alvirfrancisco]

do we really have to use this code? I think this would raise confusion.

[OG-kgwx]

thank you for the video - this is blowing my mind

[Sillylittleworld]

Thanks man! This made me understand the lesson and now I can comfortably move on. Much appreciated

[alvirfrancisco]

i dont understand. we have diferrent codes. yet i passed.

function sum(arr, n) {
// Only change code below this line
if (n <= 0) {
return 0;
} else {
return sum(arr, n - 1) + arr[n-1]
}
// Only change code above this line
}

[fonskeee]

don't now how he made this to work because here it ain't working.
i have changed it to this and now it is working.

function sum(arr, n) {
// Only change code below this line

if(n == 0){
return 0;
}

else{
return sum(arr, n-1) + arr[n-1];
}
// Only change code above this line
}

[animationcity]

brother well tried, but I wanna ask you that you were explaining this question to us or you were trying to understand it but still thank you from my side

[adelpopon]

someone can help me to understand the code?? Unfortunately this solution doesn't work :(

[utkarshtyagi]

please dont mind but i didnt find this video productive at all..m still on the same place

[sandile]

this seems way too complicated. i think i'd rather use loops...

[zken]

Thanks Mr. Ian if (n <= 0) {
return 0;
} else {
return sum(arr, n - 1) + arr[n - 1];
}