You can see this component in action in the Svelte REPL. We have also seen that for n disks, a total of 2 n 1 moves are required. Only one disk can be moved at a time We’ve already discussed a recursive solution for the Tower of Hanoi. if and else translate to if/else blocks, tower() becomes, and instead of console.log, we render a list item. You can’t place a larger disk onto a smaller disk 2. With the element added to our toolbelt, let's use it to solve the Tower of Hanoi.Ī traditional recursive JavaScript implementation of the Tower of Hanoi looks like this: function tower ( disk, source, intermediate, destination ) Įach line of the function directly translates to Svelte template syntax. Just because it compiles doesn't mean it's safe! Writing a solution Svelte will compile this component without issue, but rendering it in the browser will result in a "too much recursion" error logged to the console. For example, incrementing count in the above component will result in an infinite loop since count will never be less than zero. You can place it inside an if statement and still cause an infinite loop. You can check out the Svelte tutorial for another example of svelte:self in action.Įven with the compiler safeguards, you still need to be careful with the svelte:self element. Īdding an if statement to the above example will stop the recursion once count gets to zero. Since using the element by itself without any conditions causes an infinite loop, the Svelte compiler requires you to place inside an if or each block, or inside a slot passed to a component.įor example, this would not compile because there is no point where the component will stop rendering itself. A common use for this element is a comment thread, e.g. You can include a Svelte component recursively using the element. We can make our Svelte templates recursive using the element. The objective of the game is to shift the entire stack of disks from one rod to another rod following these three rules : Only one disk can be moved at a time. It is a mathematical game or puzzle that consists of three rods with ’n’ number of disks of different diameters. You may have encountered this problem in computer science curriculum, where it is used to introduce recursion, i.e. The Tower of Hanoi is also known as the Tower of Brahma or the Lucas Tower. The Wikipedia page on Tower of Hanoi has a section on a binary solution where the steps for an N-disk Tower of Hanoi are encoded in the binary representation of the numbers 0 to 2 N. To make this possible, a third intermediate rod is available to place disks on. It can be programmed without recursion and without stacks (or simulated stacks). You can't place a larger disk on top of a smaller disk.Only the top disk on a stack can be moved.The disks have different diameters and begin with the largest disk on the bottom and the smallest disk on top. The Tower of Hanoi asks you to move a stack of disks from one rod to another. We can express a solution to this problem only using Svelte's template syntax. The Tower of Hanoi is a classic mathematical puzzle that is often used as an introduction to recursion.
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