Understanding Recursion and Countups

[ugwen]

i will share a post that helped me and hope it’s relevant:

Why does recursion reverse itself?

function countUp(n) { if (n < 1) return []; const array = countUp(n-1) array.push(n) return array; } console.log(countUp(3)) Let’s look at how this is evaluated. Inside the console log we call countUp with n=3 so we need to evaluate that. To evaluate it we’ll need to run all the lines of the function. // lines to run for countUp(3) if (3 < 1) return []; // 3 is not less than 1 so skip this const array = countUp(3-1) // pause here! array.push(3) return array; But in the middl…