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Comment by doublec | Hacker News Reader

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You could download the routing data into IndexedDB and use that for your file system.

And you know how fast that would be? Using an ordinary DB for graph algorithms is already slowish on a powerful server ...

IndexedDB allows direct access to the blobs like a file: https://developer.mozilla.org/en-US/docs/Web/API/FileReader

Intersting! (btw: this is only read only but useful)

There's a writable interface to IndexedDB files as well: https://developer.mozilla.org/en-US/docs/WebAPI/FileHandle

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