Here is my code and I know there is some mistake in my code but I'm new to the concept of recursion. I think there is a problem cuz I tried to implement the same code as the C language. I want my answer to read and print array by using recursion And I tried to convert the c code into javascript, c++ code into javascript and lastly in python code into javascript.
var a = [1, 2, 3];
var l = a.length;
var num = 0;
function printArr(a, i, l){
for(var i=0; i<l; i++){
num = a[i];
}
if(i>=l){
return 0;
printArr(a, i+1, l); //<I think in this section I'm having a problem.>
}
}
printArr(a, 0, l);
console.log(num);
No need for that for loop.
Your printArr call should be outside if statement.
var a = [1, 2, 3];
var l = a.length;
//var num = 0; // not needed
function printArr(a, i, l) {
// Base condition - to break out of recursion
// check if index is out of array bounds, if yes return
if (i >= l) {
return;
}
// if not, print the array element at that index
console.log(a[i]);
// call the recursive function with next consecutive index
printArr(a, i + 1, l);
}
printArr(a, 0, l); Another method would allow us to avoid mucking about with indices at all, destructuring the input array and checking whether the first element is empty:
const printArr = ([x, ...xs]) => {
if (x == null) return null
console .log (x)
return printArr (xs)
}
printArr ([1, 2, 3])I would personally prefer to write this as a single expression, like this:
const printArr = ([x, ...xs]) =>
x == null ? null : (console .log (x), printArr (xs))