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by tjallingt 3108 days ago
the `=>` de-sugars to:

    var currentUrl = function(_) {
        return window.location.href;
    }
the underscore is used so they don't have to type `() =>` instead
2 comments
danso 3108 days ago
Ahhh. I think I was confused why referring to `window.location.href` would be needed to be put into a function, and then called as `currentUrl()`, rather than having currentUrl be a string value. Is this best practice? I mean, is there some `window.location.href` isn't a global object?
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wereHamster 3108 days ago
Because the value may change. If 'currentUrl' was a constant (eg. `const currentUrl = window.location.href`) it would capture the href at the start of the application, even though it might change later on (history API, pushstate etc).
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cag_ii 3108 days ago
Why wouldn't you just reference `window.location.href` when needed, instead of wrapping it up in `currentUrl`?
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danso 3108 days ago
Yeah that was my question. I was racking my head thinking of when this window.location.href wouldn't refer to what a program would want given how it almost acts like a global function in some ways (e.g. `window.location.href="http://example.com"` can be used to change the page). Maybe currentUrl is supposed to be a wrapper just incase window.location.href changes (which seems highly unlikely but again, I'm out of the loop with modern JS).
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azorba1987 3108 days ago
Some snippets, like this, read a lot like codegolf functions.
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thephyber 3108 days ago
Code Golf is about using the most terse syntax (and frankly, showing off while doing it).

This was a new syntax added to the language spec to reduce the amount of boilerplate required for common tasks.

Also, the "fat arrow function" handles "this" different inside of the function, so it can serve a slightly different function and in many event-handling cases it can be even more terse than traditional JS functions.

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