Comment by greener_grass
Comment by greener_grass 10 months ago
How is it writing React without multi-line lambdas?
They are everywhere in JavaScript and I couldn't imagine my day-to-day without them!
Comment by greener_grass 10 months ago
How is it writing React without multi-line lambdas?
They are everywhere in JavaScript and I couldn't imagine my day-to-day without them!
In JavaScript you can do this:
const f = (x, y) => {
const z = x + y;
const w = z * 2;
return z - w + x;
};
f = (
lambda x, y:
z = x + y;
w = z * 2;
return z - w + x;
)
def f(x, y):
z = x + y;
w = z * 2;
return z - w + x;
Actually you can. If you really want a multi-line lambda with your example...
```f = lambda x, y: [ z := x + y, w := z 2, z - w + x, ][-1]```
* That version does look strange, as it uses a list in order to get that last calculation. But I often use lambdas to check results in parametrized tests, and they naturally spread to multiple lines without the list hack since they're chains of comparisons.
Using a list combined with the walrus operator is a clever hack, but it's nice to not be limited to expressions. In JS you can define the equivalent of a multi-line lambda function with any number of statements (which is helpful when you're passing a function as a callback e.g. in a React hook).
That's pretty janky - I don't think it would pass review in many places!
Either name them, or squeeze multiple expressions into a tuple. More can be done, now with walrus.
I think my answer: I have no idea what multi-line lambdas are, probably explains why I find Reflex (or Rio/Streamlit, etc) amazing, haha
For a person with zero front-end knowledge, it's a game changer.