javascript recursion example
// Count Up
function countup(n) {
//Base case
if (n < 1) {
return [];
} else {
// The Recursion
const countArray = countup(n - 1);
countArray.push(n);
return countArray;
}
}
// Count Down
function countdown(n) {
// Base case
if (n < 1) {
return [];
} else {
// The Recursion
const count = countdown(n - 1);
count.unshift(n);
return count;
}
}
// User Defined
function rangeOfNumbers(startNum, endNum) {
// Base case
if (startNum - endNum === 0) {
return [startNum];
} else {
// The Recursion
const count = rangeOfNumbers(startNum, endNum - 1);
count.push(endNum);
return count;
}
}function recurse(arr=[])
{
// base case, to break the recursion when the array is empty
if (arr.length === 0) {
return;
}
// destructure the array
const [x, ...y] = arr;
// Do something to x
return recurse(y);
}
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