JavaScript

$//$ Cumulative sum of an array

$//$ Given an array of length N$,$ returns a new array of length N with the

cumulative $($running$)$ sum

$//$ e$.$g$.$ cumulative$\_$sum $([1,2,3,4])=>[1,3,6,10]$

function cumulative$\_$sum$($arr$)\{$

let arr$\_$sum $=1]$:

for$($let i $=0$; i $<$ arr. length; i$++)\{$

if i $==0)1$

arr$\_$sum. push$($arr $[$il$)$;

$\}$

else $\{$

$//($MISSING LINE OF CODE$)$

return arr$\_$sum;