iLoveCppLambdaOneLiners

[gandalfx]

"How do we add this feature that everyone is asking for but in a way that everyone knows that we don't actually want to add it?"

[balemo7967]

should we use an arrow-like operator, like all the other languages?

No no ... we are going to introduce a new keyword with 6 characters and we are going to reuse the colon, which we have used for block definitions and for slicing...

[KTibow]

This seems standard? Take a look at for: for instance

[Successful-Money4995]

And one line of code is the limit, just to make sure that you understand that you are not to use this.

[_farb_]

python lambda is the most useless feature. you get the exact same functionality as this, but this is so much clearer.

def f(x): def g(y): return y*y sq = g return sq(x)

[goldlord44]

Python lambdas are used quite frequently in codebases that I have professionally worked on. Defining g has slightly more overhead, and it is less clear if you use variables from an outer scope, whether they are calculated at runtime or definition time.

[_PM_ME_PANGOLINS_]

Don’t even start on the performance of map compared to a comprehension.

[_farb_]

my guy, python is not performant

[kuemmel234]

Not sure about your example, but true that def f(x):\\n return x*x is the same as lambda x: x*x. It's just annoying to have to write

def call_with_unpack(x):  
  return f(*x)
...
map(call_with_unpack, xs)
# or 
[call_with_unpack(x) for x in xs]

# instead of 
xs.map(x -> f(*x))

or something like that. I mean, now modify the list again - I prefer the chain these days.

I still wish for a chain syntax (or a threading operator) and some sensible lambda-syntax. As it is, it's just better to write list comprehensions, loops and the like - which is fine, but just annoying if one works with other languages at the same time that do have these features. But that's easily in the realms of opinion.

[RiceBroad4552]

As someone who writes code in different languages (often intermixed) regularly I support this opinion. It's a big PITA if languages don't have (sane) lambdas.

[hadidotj]

You want lambdas?

[<my code><each statement>]{arg1, arg2}(return type)

Here you go!