Solve problems with JavaScript

Calculate Pascal's Triangle at a specific row

.concat() or spread operator

Accumulated concatenation and check

Keep jump over next node until values are not equal

Recursive or iterative (stack)

Pseudo-element, half circle

Plus with remainder

A classic DP problem

One-line KO

Straight forward: min, max then gcd

Should draw for better imagination of how it works

Naming variables is also important