param_pam_pam could've used app.param

[grabbou]

It'd be quite cool to show users how they can profit from app.param.

app.param('message_id', function(req, res, next, messageId) {
    req.computedHash = require('crypto')
        .createHash('sha1')
        .update(new Date().toDateString() + messageId)
        .digest('hex')
    next();
});

app.get('/:message_id', function(req, res, next) {
    res.send(req.computedHash);
});

Maybe worth mentioning there are two ways to approach this problem? Showing the beginners not everything needs to be handled in a route handler might be a nice tip!

WDYT?

[grabbou]

(But actually with Express being so unopinionated they can even use general-purpose middleware so mind-fuck guaranteed)

[azat-co]

@grabbou feel free to make a pull request. It's a good idea to show param and general middleware so maybe create both.